Flood Impacts

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30
Water reaches the top of the Keokuk city levee that protects industrial area along Mississippi Drive south of Victory Park.
27
Water affects residences in Nauvoo and reaches the top of the levee protecting the historical Nauvoo House.
25.5
Water affects the railroad tracks in downtown Keokuk.
24
Water affects low lying buildings in Hamilton and affects U.S. Highway 136 near the Mississippi River bridge. Water also affects Keokuks sewage treatment plant.
23
Water affects Illinois Highway 96 between Nauvoo and Hamilton.
22
Water affects the Warsaw water treatment plant.
21.2
Lock and Dam 19 is closed.
21
Water affects Keokuks Victory Drive.
20
Water affects the industrial area in Keokuk south of the city levee and affects the parking lot at Victory Park as well as much of the park. In Alexandria, water affects U.S. Highway 61 in several places.
19.5
Water reaches critical stage for Des Moines and Mississippi Levee District Number 1.
19
Water affects low lying buildings in Warsaw and affects County Road 12.
18.4
U.S. Highway 61 closes at the bridge over the Des Moines River between Alexandria and Keokuk.
16
Water affects low lying buildings in rural areas. Water affects the railroad tracks in Alexandria.

Flood Impacts

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29
Water reaches the floor of the grain elevator office building in Gregory Landing.
25.4
Hunt and Lima Lake levees are overtopped, affecting U.S. Highway 61.
17
Water affects the road north of the grain elevator in Gregory Landing.
16
Water affects buildings in unprotected low areas.

Flood Impacts

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110000
At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
29.3
Water reaches the 12,000 volt transformer pad at Lock 20.
27
Water reaches the top of the lower gates.
26
The Lock and Dam 20 Control Center begins flooding at this height.
25.7
The Illinois levee protecting Meyer, IL is overtopped. The town of Meyer begins flooding.
24.5
Lock and Dam 20 maintenance buildings begin flooding.
20
Flood waters reach the top of the upper gates.
19.6
Water reaches the top of the lock wall, flooding the lock chamber.
18.1
Railroad tracks near the campgrounds begin flooding at this height.
18
Near this level, the lock is closed to navigation. This level will vary with circumstance. Also, the railroad crossing at the east end of Henderson Street floods at this height.
17.5
At this height, the city of Canton will install the flood gates at the railroad opening and at Route B north of town.
17.3
State Highway B, or Business U.S. Highway 61, is closed from Missouri Highway 16 in Canton to north of Canton at the levee flood gate near this level.
16.6
Front Street leading to the campground and Corps park campgrounds flood at this height.
15.6
North Front Street and the first 2-3 campsites in Mississippi Park begin flooding at this height.
14
Both banks begin to overflow.
9
Above 8.7 to 9.2 feet, the Corps will raise the gates out of the water, allowing for "open river" conditions. This corresponds to a discharge of approximately 110,000 cfs.
8.5
The Corps will not allow the pool level to drop below 8.5 feet (higher flows below 100K). At low flows, they allow a 2-foot variation between 11.0 and 13.0 feet. At higher flows below 100K, the range is actually lower, between 8.5 and 10.5 feet. Above 110K cfs, the gates are raised above the water surface, allowing open river conditions.

Flood Impacts

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30.8
Water will begin entering the front door of the Lions Club near this height.
28.4
The main floor of La Grange City Hall begins flooding near this height.
26
Near this height several homes and businesses along the east side of Business 61 / Main Street in northern LaGrange begin flooding.
24.8
At the Consolidated Grain & Barge plant, at this height water will begin overtopping the flood wall protecting the dryer area.
24.5
The base of La Grange Public Library at Main Street and Washington Street begins flooding near this height.
23.6
At this height, the storage area of the shed on Marion Street begins flooding.
20.7
Missouri Route B is closed from Route C in LaGrange south to near the intersection with U.S. Highway 61.
20.1
At this height water will begin flooding the foundation of a utility storage building on Marion Street.
19.5
BNSF Railroad main line begins to flood near the river gage in La Grange.
19.3
Water begins covering the lower utility road between the Consolidated Grain & Barge elevators and the river channel.
18.5
Near this height, 3rd Street begins flooding near the casino parking lot.
18.1
Wharf Street begins flooding at this height just upstream from the Consolidated Grain & Barge plant.
18
The entrance to the lower parking lot at the Mark Twain Casino begins flooding near this height, requiring the use of an alternate entrance.
17.5
Front Street, providing access to elevated riverfront homes in south La Grange near the casino, begins flooding near this height. Also, the alley behind several homes and businesses along Main Street (Hwy B) begins flooding at this height.
16.5
The lower portions of the Mark Twain Casino parking lot begin to flood near this height.

Flood Impacts

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35
The Flood wall protecting the Quincy Water Plant is overtopped. The South Quincy Drainage District levee is overtopped near this height, flooding 5500 acres on the Illinois side 1 to 9 miles downstream of Quincy.
34
Near this height, the South Quincy Drainage District levee overtops.
31
The Comstock Stove Castle Company warehouse begins flooding near this height.
30.8
Near this height, all roads leading to Bottom Road north of Quincy are closed to all traffic.
29.7
Indian Grave Levee north of Quincy is overtopped.
29.6
The Fabius River Drainage District levee is overtopped near this height, flooding 14000 acres on the Missouri side from 5 miles upstream of Quincy and 4 miles downstream of Quincy.
29.5
The main floor of the South Side Boat Club floods near this height. Also, the Union Township Drainage District levee is overtopped, flooding 5000 acres on the Missouri side about 4 to 8 miles upstream of Quincy.
29
R.J. Peters Drive in south Quincy is closed between 8th Street and Gardner Expressway, or Illinois Route 57.
28.8
Flood water reaches the low steel on the BNSF bridge in Quincy.
28.2
Damage begins at Quincy sewage treatment plant.
28
The city of Quincy begins sandbagging. Also, the land around the log cabins at Log Cabin Village on Quinsippi Island begins flooding.
26.3
Eastbound lanes of the US Highway 24 bridge (Memorial Bridge) are closed. Eastbound traffic is diverted to the northern US Highway 24 bridge, or onto the Bayview Bridge.
26
At this height, Quinsippi Island roads flood by the park shelters and Lenane Park begins flooding.
24
In Quincy, Bonansinga Drive is closed at Cedar Street and at Koch's Lane. Illinois Highway 57 is closed between Jefferson Street and the Gardner Denver company. The Art Keller Marina docks are cabled off and closed.
23.5
County Highway 7 in Quincy south of Parker Heights Park is flooded.
22.1
Bonansinga Drive at Bob Bangert Park begins to flood. Also, the basement of the South Side Boat Club begins flooding near this height.
22
The Clat Adams Bicentennial Park, just north of the Memorial Bridge, begins flooding. Also at this height, most roads in Kesler Park are flooded.
21.9
The lower floor of the Quincy Boat House begins flooding near this height.
21.1
The roundabout at the north entrance to the Clat Adams Bicentennial Park begins flooding at this height.
20
All America and Bob Bangert parks begin to flood. Also, the Art Keller Marina walkways and the south boat ramp at Kesler Park begin flooding.
19.5
Garages beneath raised homes along Bonansinga Drive will begin flooding near this height.
18.5
BNSF Railroad main line, 10 to 16 miles above Quincy begins to flood at several locations.
15
Riverside campsites south of Quincy begin to flood.
14
Unprotected bottomlands flood on both sides of the river above and below the gage.

Flood Impacts

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140000
At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
26.9
Missouri Highway 168 east of Palmyra near the BASF plant closes near this height.
25.7
At this height, the lock wall is inundated.
25
Quincy Waterworks inundated.
21.9
Near this level, the lock is closed to navigation. This level will vary with circumstance.
14
Unprotected bottomlands flood.
12.3
This is the upper limit of the target pool level at Lock and Dam 21.
12.2
This is the target pool level for navigation at Lock & Dam 21.
12
At some point between 11.6 to 12.1 feet, the Corps will lift all gates out of the river creating "open river" conditions, corresponding to an approximate discharge of 140,000 cfs.
11.8
This is the lower limit of the target pool level at Lock & Dam 21.

Flood Impacts

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34
This is the top of the Hannibal Floodwall.
28.2
The Fabius River levee (Right Bank) is overtopped between River Mile 332.4 and 323.5, flooding 14,200 acres. The Marion County levee is overtopped between River Mile 320.7 and 323.5, flooding 4000 acres.
28
The elevated boat club, outside the levee, floods.
27.9
Highway 168 NW of Hannibal near Clear Creek is closed.
27.8
The Sny Island and South Quincy levees are overtopped between River Mile 315.4 and 264.3, flooding 110,000 acres. The South River levee is overtopped between River Mile 320.5 and 312.1, flooding 10,000 acres.
27.6
Near this height, Warren Barrett Drive is closed east of Lemon Street.
27.5
The South Quincy Levee (Left Bank) is overtopped between river miles 325.4 and 317.8, flooding 5500 acres. Also, Highway 36 in Illinois begins flooding near this height.
27
A few small businesses along the riverfront outside of the floodwall, along Bear Creek and along the minnow branch of Bear Creek are either cut-off or inundated. A large portion of downtown Hannibal is cut-off.
26.2
The Sny Island Drainage District Levee is overtopped.
26
Near this height, the playing field area at Clemens Field begins flooding. At Southside Recreation #2, all streets and park property are flooded and inaccessible.
25.1
State Highway 79 closes from south of Hannibal to Missouri Route N.
25
Near this height, Lemon Street, Colfax Street, Munger Street, and Dulany Park are flooded and the park is closed.
24.5
Sawyer's Family Fun Park south of Hannibal typically closes near this level as parking access to the park is cut off. The Norfolk and Southern Multisports Complex and Ringer Park are flooded and closed near this height.
24
The Admiral Coontz Recreation Center, formerly the old armory, on Collier Street floods. Numerous businesses in southwest Hannibal outside the flood wall begin to flood.
23.5
At this height, the Admiral Coontz Recreation Center will be evacuated and closed as floodwater enters the southwest corner of the building. Also, the south end Dulany Park begins flooding and the south ends of the Norfolk and Southern Multisport Comlex and Ringer Park flood near this height.
23
Area south of Collier Street and along Sycamore Street outside the Hannibal flood wall floods. Also near this height, the parking lot around the Admiral Coontz Recreation Center begins flooding. South Main Street south of the flood wall is closed.
22.8
Highway 79 begins flooding south of Hannibal, and it may be closed from south of Hannibal to Route N.
22.5
Near this height, the west, east, and south building entrances to the Admiral Coontz Recreation Center building become inaccessible.
22
BNSF tracks just south of Hannibal are flooded.
21.5
At this height, water will reach the base of the remaining three flood gates on Broadway Avenue and Main Street, so these gates should already be installed and locked down. Bear Creek Trail and Dempsey Dog Park begin flooding and are closed near this height. Access to Sodalis Nature Preserve parking is flooded at 6th and Ely Streets. The south end of the Norfolk and Southern Multisport Complex begins flooding near 6th and 7th Streets. The grandstand area of Clemens Field begins flooding.
20.5
The Burlington Northern/Sante Fe railroad tracks running North and South and the railroad yards begin to flood. At this height, water reaches the base of the two flood gates at Hill Street and Center Steet, so these gates should already be installed and locked down. Also at this level, preparations are made to install the remaining 3 flood gates on Broadway Avenue and Main Street if the forecast reaches 21.5 feet.
20.2
Nipper Park begins flooding on the Hannibal riverfront.
19
The Corps of Engineers begins flood fight procedures. At this level, preparations are made to install two flood gates at Hill Street and Center Street if the forecast exceeds 20.5 feet.
18
The northern end of Southside Recreation #2 Park along Bear Creek begins flooding at this height. Gate wells are shut down to prevent the sewers from backing up. Also at this level pumps are set to standby.
17
John Hay Recreation Area on east side (inside the Illinois Sny Levee) begins flooding.

Flood Impacts

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160000
At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
28.6
Water enters the elevated flood building north of the lock house.
28
In Monkey Run, at least a dozen homes are flooded at this level.
27.8
Saverton homes begin flooding near this level.
27.3
The work shop building at Lock and Dam #22 begins flooding at this height.
27
Sny Island Cell #1 levee is overtopped
26
In Monkey Run (north of Saverton), houses begin flooding near this level.
25.7
Water enters Lock house north door and the railroad tracks crossing.
25.5
Homes in Riverview Acres (just south of the lock and dam) begin to flood. Also, North Saverton Road floods near this height.
25.2
Missouri Route E becomes impassable and is closed from Saverton Road near the Hascall Creek bridge to Lock and Dam 22.
24.5
Highway 79 is closed at the Continental Cement Plant.
24.2
Missouri Route E begins flooding at the lowest points.
21.8
At this height, the ties of the BNSF railroad tracks begin flooding.
21.4
Near this level, the lock is closed to navigation. This level will vary with circumstance. Also, BNSF railroad tracks just south of Hannibal are flooded.
15.5
An access road to riverside raised homes on the riverward side of the Sny levee begins to flood near this level.
13.5
This is the upper navigational limit for the pool at Lock & Dam 22.
13.4
This is the target pool for navigation at Lock & Dam 22.
13
This is the lower navigational limit for the pool at Lock & Dam 22.
12
Buildings in unprotected areas are damaged. At this approximate stage, the Corps will lift all gates out of the river, creating "open river" conditions. This takes place at a discharge of around 160,000 cfs.

Flood Impacts

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33.1
Near this height, water will begin to flood U.S. Highway 54 on the Illinois side between the Champ Clark bridge and the levee.
29.5
The boat house floods.
28.6
The floodwall at the sewage treatment plant is overtopped, forcing the plant shutdown.
28.4
This is the RECORD FLOOD LEVEL that was reached on July 28 1993.
28.3
This represents the height of the railroad tracks along Water Street.
28
Water reaches low steel on railroad bridge in Louisiana.
27
The Sny Island Cell #2 Levee is overtopped. This flood level was reached on April 24 1973.
26
Floodgates and sandbags are used to protect the city water treatment intake.
25.9
Near this height the main floor of the Two Rivers Marina off U.S. Highway 54 begins flooding.
25.5
The south end of Main Street in Louisiana begins flooding.
25.25
Missouri Highway 79 from County Road 115 to County Road 117 is closed northwest of Louisiana.
23.5
Sny Levee District starts mobilizing to close levee.
23
Numerous houses and businesses in southeast Louisiana begin to flood.
22.8
Highway 79 is closed at Route D south of Louisiana near the Dyno-Nobel plant and Calumet plant.
21.7
Floodgates are installed at the city sewage treatment facility.
21.5
Water encroaches both shoulders of State Highway 79 about one half mile south of Louisiana at the Junction of County Road D. Also at this level low sections highway 79 in Louisiana are flooded. Motorists are detoured onto side streets. A business at the SW corner of Highway 79 and Alabama begins flooding.
21.3
Highway 79 near Alabama Street at Gladney's car lot is closed.
21
Highway 79 begins flooding near 3rd Street on the south side of Louisiana.
20.8
Near this height, the railroad bridge below the mouth of Noix Creek is closed. Above this height, the bridge is unable to open to vessel traffic.
20.2
Illinois Street between Main and Highway 79 begin flooding.
19.8
Entrance to Noix Creek Campground begins flooding.
19.6
Maryland Steet at 4th Street by the Town Branch bridge begins flooding near this height.
17
The parking area at the boat house floods.
15
The first quarter mile of Edison Avenue beyond the railroad tracks begins flooding near this height.
12.2
For barge navigation, the Corps will attempt to keep the river at or below this level. Year-round target levels are between 11.5 and 12.2 feet.
11.5
For safe navigation of barge traffic, the Corps will try to keep the river above this level. Year-round target levels are between 11.5 and 12.2 feet.

Flood Impacts

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153000
This flow is approximately where CLKM7 goes to "open river" conditions.
38.1
Sny Island Cell #4 levee is overtopped.
37.1
Sny Island Cell #3 levee is overtopped.
36.25
Highway 79 is closed from one mile south of Annada to two miles north of Annada. Route H is closed from Annada to about one mile west of Annada.
36
Near this height, the top of the sewage treatment lagoon just south of town is overtopped.
35
Near this height, the lock wall at Lock 24 is inundated.
34
Route W (Kentucky Street) is closed for one block between Third Street and Highway 79. Also, near this height, the living areas of homes in the Port Marmac area begin flooding.
33
Clarksville city businesses from 1st Street to 3rd Street begin to flood.
32.79
IL route 96 from near Mozier to County Road 2 inundated and closed near this height.
32.5
Near this level, the lock is closed to navigation.
32.29
Route N is closed between Route D and Highway 79.
32
Front Street begins to flood.
31.5
Burlington Northern SF railroad tracks begin to flood. Also, Highway 79 is closed about a mile south of Clarksville.
31
The Clarksville Boat Club, south of Lock & Dam 24, begins to flood. First Street begins flooding. A sand-filled barrier at the bottom of Howard Street is considered. In Hamburg, Illinois, Water Street floods.
30.8
Near this height, Highway 79 is closed from Route N to about a mile northwest of that intersection.
30
East bank (Illinois side) begins to flood.
29
Water enters the parking lot entrance at the Clarksville Riverfront Park.
27.2
Silo Park just northwest of Clarksville off Highway 79 begins flooding.
25.5
State Route P east of Elsberry begins flooding just east of the levee.
25.3
The road to Port Marmac, a riverside community of about 15 homes just south of Clarksville, begins flooding.
23.5
Flooding begins in unprotected areas.
23
At this approximate stage, the Corps will take gates out of the river, creating "open river" conditions. This corresponds to an approximate stage of 155,000 cfs.

Flood Impacts

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145000
This is the flow at which CAGM7 will go to "open river" conditions.
37.1
This is the level at which the Winfield levee failed in June 2008.
37
Water reaches the top of the lock wall. Also at this level water completely floods Lock and Dam Park in Winfield. Highway 79 is closed a half mile south of Highway 47 for another half mile.
36.29
Highway 79 is closed through the town of Foley.
35.6
Highway 79 is closed from Winfield north to Route Y.
35.5
Highway 79 is closed from Bobs Creek to one mile south.
35.1
The levee behind Lock and Dam 25 will overtop at this height without additional protection.
34.6
Route M is closed south of Elsberry from Highway 79 east to where state maintenance ends near Apex Lane.
34.5
Near this height, the office building and storage building of Kimaterials, a sand and gravel company on Highway 79 between Winfield and Old Monroe, begins flooding. Also, the Corps has not kept Lock 25 open above this height.
34
This is the level of the levee protection for Winfield.
33
Route N is closed from Highway 79 at Winfield to where state maintenance ends.
32.5
Near this level, Winfield Lock 25 is closed to navigation.
30
The Golden Eagle Ferry will likely close near this level. Lakeshore Drive in northern St. Charles County becomes impassable near this level.
29.8
Much of County Highways B and C in eastern St. Charles County are flooded.
29.5
Highway B in eastern St. Charles County floods near the Dardenne Creek bridge.
29.3
The following roads in northern St. Charles County close near this level: Peruque Creek Road near Highway 79, Dalbow Road near Highway 79, and Firma Road.
29.2
Lakeview Road in northeastern St. Charles County is closed north of the railroad tracks. Also, Highway C between Highway B and Silvers Road will be closed near this height.
29
Route 96 at Mozier Landing closes.
28.6
Water begins covering Highway C about a half mile south of Highway B in St. Charles County.
28.3
Near this height, Lakeview Drive becomes impassable and Kampville Road begins flooding in northern St. Charles County.
27.8
Near this height, Wilson Road just north of Washeon Road and Lehmond Island Road south of Sunset Drive in northern St. Charles County begin flooding.
27.5
At this stage, Lock and Dam 25 will stockpile 200 tons of sand, 12,000 sandbags, and 10,000 square feet of polyethylene plastic as a precaution.
23
A few local islands begin to flood.
21.6
Near this stage, the Corps will raise all gates out of the river, creating "open river" conditions. This corresponds to an approximate discharge of 145,000 cfs.

Flood Impacts

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37
Near this height, floodwater begins to impact Grafton City Hall.
33.5
Nutwood Levee is Overtopped.
32.1
Methodist Church at Main St. and Vine St. begins flooding.
31
The hangars at the south end of Smartt field begin to flood.
30.9
Missouri Route B from Washeon Road to Seeburger Road is closed near this height.
30.1
Water reaches the intersection of Main Street and Maple Street.
29.1
Water reaches Main at Church Street.
29
Route 100 between Grafton and Alton at Clifton Terrace is flooded near this height.
28.8
Water begins entering the north hangars at Smartt Field.
28.5
Water begins entering the ramps on the north end of Smartt Field as the northwest and northeast corners are already flooded.
28.4
Water reaches Main Street at the Vistors Center
28.3
Intersection at Main (Route 100) & Route 3 is closed. Also at this level the Northeast Corner of Smartt Airfield begins flooding. Grafton Hills Drive is closed to all but local and select (UPS, FedEx, and Amazon) delivery traffic.
28
Agricultural levee north of Highway 370 is overtopped, flooding a St. Peters recreational area around a lake near 370 and Truman.
27.6
Beasley Fish Market at Main Street and Overmeyer begins flooding.
27.5
The intersection at Main Street and Dagget Hollow begins flooding.
26.5
At this height the entrance to the Illinois Youth Center-Pere Marquette becomes flooded, forcing the evacuation of those staying there.
26.4
Residential flooding in Grafton occurs.
26
Water distribution system begins to flood so emergency measures begin.
25.6
Water surrounds base of Aerie's Resort at Main Street (Hwy 100) near Market.
25.5
Brussels Ferry closes near this height. O'Jan's Fish Stand in Grafton closes near this height.
25.2
The intersection at Main Street and Canal Street begins flooding.
25
Ball field south of Main Street and Hawg Pit BBQ begin flooding.
24.9
Water reaches the intersection of Main St. and Edwards St.
24.7
City of Grafton begins to detour traffic along Route 100 (Main Street) at Evans Street. Also at this level the Catholic Church parking lot at Main & Evans begins flooding. This represents the lowest point on Main Street in Grafton.
24
Roads within Chautauqua and Elsah begin flooding near this height.
23.6
Missouri Route B from Highway 94 to New Town is closed near this height.
23.4
Huster Road and South Shore Drive, both at the entrance to the South Shore subdivision in eastern St. Charles County, are closed near this level.
22.5
East end of Main Street in Portage des Sioux begins flooding near this height.
21.9
In northern St. Charles County, Missouri Route B from Lehmond Island Road to Kampville Drive, Wilson Road at Washeon Road, and Grafton Ferry Road and Sherwood Harbor Road north of Smartt Field are closed. West of Portage des Sioux, Sioux Drive is also closed at this height.
21.5
In Portage des Sioux, MO, Le Sieur Street leading to the Marina and to Our Lady of the River Statue is flooded.
21
Water begins flooding the floor at the Palisades Marina in Portage Des Sioux. Access to homes along North Shore Drive in eastern St. Charles County becomes cut off near this height.
16.2
For navigational purposes through Alton Lock and Dam control, the Corps will strive to keep the river below this level, if at all possible. Above this level, water inundates land not owned by the USACE.
14.2
For safe navigation of barge traffic, the Corps will try to keep the river above this level.