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Weather Forecast Office Tallahassee, FL

Southeast River Forecast Center

Flood Warning

Hydrograph

River at a Glance

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About this graph

Tabular Data (UTC)

Tabular Data (EDT)

Datum: Not Available

Metadata

NOTE: Forecasts are not available for the Apalachicola River at Chattahoochee. Only observed stages are available for this point.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet)

Major Flood Stage:	74
Moderate Flood Stage:	69
Flood Stage:	63
Action Stage:	56
Low Stage (in feet):	39.5

Historic Crests
(1) 76.56 ft on 03/12/1998
(2) 76.21 ft on 07/10/1994
(3) 74.04 ft on 03/21/1990
(4) 73.28 ft on 12/29/2015
(5) 71.89 ft on 03/09/2020
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 67.68 ft on 03/12/2024
(2) 67.38 ft on 02/16/2024
(3) 57.18 ft on 02/01/2023
(4) 62.59 ft on 04/09/2022
(5) 62.85 ft on 09/20/2020
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 37.83 ft on 09/06/1957
(2) 38.28 ft on 09/23/1956
(3) 38.37 ft on 10/20/1955
(4) 38.57 ft on 10/21/2016
(5) 38.76 ft on 09/28/1954
Show More Low Water Records

Zoom Level:16

	Gauge Location	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

If you notice any errors in the below information, please contact our Webmaster
Photos (1) Apalachicola River at Chattahoochee - KML

Low Water Impacts

If you notice any errors in the below information, please contact our Webmaster

10 kcfs	About half of all streams and sloughs in nontidal floodplain become impassable at 10,000 cfs, blocking access from main stem to floodplain for fish, fisherman, and hunters. Extent/reach: Floodplain streams, sloughs, and lakes along 86 river miles (mile 21-107).
11 kcfs	Flow needed to provide sufficient depths at tributary mouths for fish to move between the tributaries and main channel.
13 kcfs	Barges and large boats cannot navigate the river (at Blountstown gage of 6 feet or lower, which is approximately equivalent to 13,000 cfs at Chattahoochee gage). Reach: Upper 86 miles (mile 21-107), especially at problems reaches (e.g. near Corley Slough).
15 kcfs	Most Tupelo-Cypress swamps in nontidal reaches of the annual floodplain are exposed and no longer inundated at 15,000 cfs. Inundation in wetland forests March-May is important habitat for the primary fish spawning season, and also maintains healthy forest structure and species composition in swamps. Extent/reach: Approx. 19,000 acres of Tupelo-Cypress swamps bordering 57 miles of river (mile 21-78).
21 kcfs	Releases to the Apalachicola River approximate or exceed inflows into the basin whenever basin inflows approached 21,000 cfs or lower during the Gulf Sturgeon spawning period.
29 kcfs	The extent of connected aquatic floodplain habitat increases substantially at flows above 29,000.
5.0 kcfs	Minimum flow from Woodruff Dam. Swift Slough is disconnected from the main stem of the Apalachicola River
5.6 kcfs	Level needed for the Swift Slough to remain minimally connected to the river. Dissolved oxygen declines to lethal levels.
6 kcfs	More than 85% of all streams and sloughs in nontidal floodplain become impassable at 6,000 cfs, blocking access from main stem to floodplain for fish, fisherman, and hunters. Extent/reach: Floodplain streams, sloughs, and lakes along 86 river miles (mile 20-106). In many areas of the estuary, salinity levels increase to intolerable or lethal levels for estuarine biota (oysters, submerged aquatic vegetations, benthic invertebrates, etc). Extent/reach: Nearly 100 miles of brackish-water streams in the lower Apalachicola River and distributaries, plus approx. 110,000 acres of bays and sounds in the Apalachicola Bay system.
8 kcfs	Low flow operations protocol implemented when flows approached levels less than 8,000 cfs to minimize impacts to mussel species.
9 kcfs	In some areas of the estuary, salinity levels increase to intolerable or lethal levels for estuarine biota (oysters, submerged aquatic vegetations, benthic invertebrates, etc). Extent/reach: Nearly 100 miles of brackish-water streams in the lower Apalachicola River and distributaries, plus approx. 110,000 acres of bays and sounds in the Apalachicola Bay system.

About This Location

Latitude: 30.700833° N, Longitude: 84.859167° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	63 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	Not Available	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	Not Available	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	NULL	NULL

Current/Historical Observations:

Additional Information

Auxillary Site USGS Number 02358001 has been temporarily substituted unitl main site USGS Number 02358000 primary and secondary gages have been repaired.

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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

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Tallahassee, FL 32306-4509
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Page last modified: 2-Nov-2020 7:30 PM

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