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This probabilistic forecast is issued by the North Central River Forecast Center.
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About this graph
Forecasts for the Mississippi River at Grafton are issued routinely year-round.
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Upstream Gauge - at Winfield Lock and Dam 25 Upstream Gauge
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 29
Moderate Flood Stage: 24
Flood Stage: 20
Action Stage: 18
Low Stage (in feet): -9999

Historic Crests
(1) 38.17 ft on 08/01/1993
(2) 35.17 ft on 06/07/2019
(3) 33.12 ft on 04/28/1973
(4) 32.13 ft on 06/18/1844
(5) 32.10 ft on 05/07/2019
(6) 30.94 ft on 06/04/2013
(7) 30.91 ft on 12/31/2015
(8) 30.80 ft on 06/29/2008
(9) 30.70 ft on 06/15/1858
(10) 30.40 ft on 05/29/1995
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 20.80 ft on 05/10/2023
(2) 21.28 ft on 05/07/2022
(3) 20.66 ft on 04/14/2021
(4) 21.86 ft on 03/20/2021
(5) 19.48 ft on 07/03/2020
(6) 22.54 ft on 06/01/2020
(7) 22.38 ft on 03/31/2020
(8) 20.12 ft on 01/13/2020
(9) 20.25 ft on 11/02/2019
(10) 22.67 ft on 10/13/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -1.10 ft on 12/11/1937
(2) -0.80 ft on 12/30/1933
(3) -0.30 ft on 12/07/1895
Show More Low Water Records
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
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.
Photos
(1) Flood of 1993 along Main Street in Grafton (Courtesy USGS)
(2) Intersection of Highway H and Highway 94 near Portage des Sioux on June 6, 2019 near 35 feet
(3) Ready's Fish Market and O-Jan's Fish Stand in Grafton on June 29, 2008 at 30.7 feet.
(4) La Marsh House and other residences at Main and Vine Streets on June 29, 2008 at 30.7 ft.
(5) Cedar and Main Streets on June 29, 2008 at a stage of 30.7 feet.
(6) Home on Main Street west of Highway 3 on June 29, 2008 at a stage of 30.7 feet.
(7) Residential flooding along Main Street near Harrison Street on June 29, 2008 at 30.7 feet.
(8) Homes along Highway 100 in downtown Grafton on June 29, 2008 at a stage of 30.7 feet.
(9) North end of Smartt Field looking south on June 26, 2008 at a Grafton stage of 30.4 ft.
(10) Homes at the north end of Seeburger Road on June 23, 2008 at a stage of 29.5 feet.
(11) Marina on Blaze Station Road on June 23, 2008 at a stage of 29.5 feet.
(12) Harbor at Portage Des Sioux on June 23, 2008 at a stage of 29.5 feet.
(13) Cassens Live Bait in Grafton on June 21, 2008 at a stage of 29.1 feet.
(14) Grafton house near Sycamore and Washington Streets on June 21, 2008 at a stage of 29.1 ft.
(15) Elsah street flooding on June 21, 2008 at a stage of 29.1 feet.
(16) Grafton car wash along Highway 100 on June 21, 2008 at a stage of 29.1 feet.
(17) Chataqua street flooding on June 21, 2008 at a stage of 29.1 feet.
(18) Intersection of Highway 100 (Main Street) and Highway 3 in Grafton on June 21, 2008 at 29.1 ft.
(19) O-Jan's Fish Market in Grafton on June 21, 2008 at a stage of 29.1 feet.
(20) Businesses on Main Street (Route 100) at Route 3 in Grafton on June 21, 2008 at 29.1 feet.
(21) Houses along Main Street (Highway 100) near York Street in Grafton on June 21, 2008 at 29.1 ft.
(22) SCYSA soccer complex on June 22, 2008 at a stage of 29.1 feet.
(23) Hawg Pit BBQ on June 26, 2010 at a stage of 26.45 feet.
(24) Homes near Main and Church Streets on June 26, 2010 at a stage of 26.45 ft.
(25) Grafton city park flooding on June 26, 2010 at a stage of 26.45 feet.
(26) Highway 100 west of Grafton on June 26, 2010 at 26.45 feet.
(27) Car wash in Grafton on Highway 100 on June 26, 2010 at 26.45 feet.
(28) Main Street (Hwy 100) begins flooding west of Highway 3 on June 26, 2010 at 26.45 ft.
(29) Parking lot at St. Patrick's Catholic Church on June 26, 2010 at 26.45 feet.
(30) Ballfield at Main and Evans Streets in Grafton on June 26, 2010 at a stage of 26.45 feet.
(31) Parking lot at the Portage des Sioux Nature Area on March 30, 2010 at 23.9 ft.
(32) Le Sieur Street and Our Lady of the Rivers in Portage des Sioux on March 30, 2010 at 23.9 feet.
(33) Houses along Lawrence Street in eastern Portage des Sioux on March 30, 2010 at a stage of 23.9 ft.
(34) Grafton Ferry Road on March 30, 2010 at a stage of 23.9 feet.
(35) East end of Main Street in Portage Des Sioux on March 30, 2010 at a stage of 23.9 ft.
(36) Clubhouse in Chataqua on March 30, 2010 at a stage of 23.9 feet.
(37) Hawg Pit BBQ restaurant at Main and Evans Streets in Grafton on March 30, 2010 at 23.9 feet.
(38) Mississippi River at Grafton, IL gaging station
(39) View looking upstream with staff gage in foreground
(40) View looking downstream

Other Real-time and/or Archive Data Sources:
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How low could the river get?
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
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12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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