Chattahoochee River above Roswell
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 04/04/2025 9:00 PM EDTCATEGORY STAGE 
Major Flooding 17 ft Moderate Flooding 13 ft Minor Flooding 9 ft Action 8 ft Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
Gauge reading affected by reservoir operations.
River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 20 - Extensive flooding of many homes and businesses will result on Riverside Road. Sections of Riverside Road will be under water.
- 17 - Major flooding begins. The Fulton County Water Pollution Control Facility will flood between 17 and 17.5 feet. Eves Road begins to flood. Numerous homes are flooded along Riverside Road and Old Riverside Road.
- 14 - Moderate flooding expands of yards...walkways...access roads and some homes along portions of Riverside Road...Old Riverside Road and Azalea Drive. The tennis courts at the Huntcliff Club...the swimming pool and lower portions of the club house are flooded. Water is around three feet deep in the horse stables. The water level floods the gage house and automated stage readings are unlikely.
Gauge Location
Recent Crests
| 1. | 10.37 ft | on 09-27-2024 |
| 2. | 9.23 ft | on 03-06-2024 |
| 3. | 9.77 ft | on 01-04-2023 |
| 4. | 9.77 ft | on 09-08-2021 |
| 5. | 11.51 ft | on 10-11-2020 |
Recent Crests
| 1. | 10.37 ft | on 09-27-2024 |
| 2. | 9.23 ft | on 03-06-2024 |
| 3. | 9.77 ft | on 01-04-2023 |
| 4. | 9.77 ft | on 09-08-2021 |
| 5. | 11.51 ft | on 10-11-2020 |
| 6. | 9.68 ft | on 03-25-2020 |
| 7. | 9.76 ft | on 04-19-2019 |
| 8. | 9.97 ft | on 12-28-2018 |
| 9. | 9.67 ft | on 05-19-2013 |
| 10. | 11.96 ft | on 09-21-2009 |
| 11. | 9.17 ft | on 08-13-2005 |
| 12. | 9.94 ft | on 09-17-2004 |
| 13. | 9.20 ft | on 03-06-2003 |
| 14. | 9.10 ft | on 05-08-1998 |
| 15. | 9.54 ft | on 01-27-1996 |
| 16. | 8.70 ft | on 08-21-1992 |
| 17. | 9.28 ft | on 09-02-1991 |
| 18. | 9.89 ft | on 03-17-1990 |
| 19. | 8.98 ft | on 12-06-1983 |
| 20. | 8.29 ft | on 04-08-1983 |
| 21. | 8.64 ft | on 02-03-1982 |
| 22. | 8.63 ft | on 03-24-1980 |
| 23. | 9.75 ft | on 04-13-1979 |
| 24. | 8.45 ft | on 01-25-1978 |
| 25. | 8.90 ft | on 03-30-1977 |
Historic Crests
| 1. | 11.96 ft | on 09-21-2009 |
| 2. | 11.51 ft | on 10-11-2020 |
| 3. | 10.37 ft | on 09-27-2024 |
| 4. | 9.97 ft | on 12-28-2018 |
| 5. | 9.94 ft | on 09-17-2004 |
Historic Crests
| 1. | 11.96 ft | on 09-21-2009 |
| 2. | 11.51 ft | on 10-11-2020 |
| 3. | 10.37 ft | on 09-27-2024 |
| 4. | 9.97 ft | on 12-28-2018 |
| 5. | 9.94 ft | on 09-17-2004 |
| 6. | 9.89 ft | on 03-17-1990 |
| 7. | 9.77 ft | on 01-04-2023 |
| 8. | 9.77 ft | on 09-08-2021 |
| 9. | 9.76 ft | on 04-19-2019 |
| 10. | 9.75 ft | on 04-13-1979 |
| 11. | 9.68 ft | on 03-25-2020 |
| 12. | 9.67 ft | on 05-19-2013 |
| 13. | 9.54 ft | on 01-27-1996 |
| 14. | 9.28 ft | on 09-02-1991 |
| 15. | 9.23 ft | on 03-06-2024 |
| 16. | 9.20 ft | on 03-06-2003 |
| 17. | 9.17 ft | on 08-13-2005 |
| 18. | 9.10 ft | on 05-08-1998 |
| 19. | 8.98 ft | on 12-06-1983 |
| 20. | 8.90 ft | on 03-30-1977 |
| 21. | 8.70 ft | on 08-21-1992 |
| 22. | 8.64 ft | on 02-03-1982 |
| 23. | 8.63 ft | on 03-24-1980 |
| 24. | 8.45 ft | on 01-25-1978 |
| 25. | 8.29 ft | on 04-08-1983 |
Low Water Records
Low Water Records
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 875.18 ft |
| moderate Flooding | 871.18 ft |
| minor Flooding | 867.18 ft |
| action | 866.18 ft |
| Latest Value | 861.11 ft |
| Gauge Zero | 858.18 ft |
Gauge Photos
No Images Found
Unique Local Info
A note on the crest history above: The crest history shown on this page is unique to this gauge (NWS: RWLG1, USGS: 02335450) and is available from 1977 to present. A previous gauge near this location (USGS: 02335500) had additional peak flows and crest history available before 1960, including a crest of 23.4 feet in 1946. This historic crest is based on a different datum and is prior to the construction of Buford Dam (Lake Lanier), and therefore not considered a 'modern' crest, and not included above.
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Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels |
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| 10 Day (HEFS) | 7 Day (NAEFS) | 7 Day (GEFS) |
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Note: Use the official hydrograph at the top of this web page for river levels within the next 72 Hours.
Collaborative Agencies
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.