Cosumnes River at McConnell
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
- Downstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 07/05/2025 3:15 PM PDTOfficial Forecast (FCST) 07/05/2025 7:38 AM PDTRecord: 48.5 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 53.5 ft Moderate Flooding 53.4 ft Minor Flooding 44.5 ft Action 38.5 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
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
- 46.5 - At approximately 44,000 cfs, water exits the river upstream and downstream of Highway 99. Dillard Road is flooded from Highway 99 to Riley Road. Twin Cities Road is flooded from Hardesty Lane to Christensen Road.
- 44.5 - Flood stage.
- 41.5 - The Cosumnes River overflow channel begins to flow.
Gauge Info
| Coordinates | 38.3575, -121.344 |
| RFC | CNRFC |
| State | CA |
| WFO | STO |
| County | Sacramento |
| Data Provider(s) | |
| State of California / Department of Water Resources | DWR CDEC ID: MCC |
Gauge Location
Recent Crests
| 1. | 42.98 ft | on 03-02-2024 |
| 2. | 41.90 ft | on 03-15-2023 |
| 3. | 38.99 ft | on 12-24-2021 |
| 4. | 32.00 ft | on 01-29-2021 |
| 5. | 38.18 ft | on 04-06-2020 |
Recent Crests
| 1. | 42.98 ft | on 03-02-2024 | |
| 2. | 41.90 ft | on 03-15-2023 | |
| 3. | 38.99 ft | on 12-24-2021 | |
| 4. | 32.00 ft | on 01-29-2021 | |
| 5. | 38.18 ft | on 04-06-2020 | |
| 6. | 42.04 ft | on 02-15-2019 | |
| 7. | 42.92 ft | on 03-23-2018 | |
| 8. | 43.84 ft | on 02-10-2017 | |
| 9. | 43.97 ft | on 01-01-2017 | |
| 10. | 40.19 ft | on 03-14-2016 | |
| 11. | 46.12 ft | on 04-05-2006 | |
| 12. | 47.02 ft | on 01-01-2006 | |
| 13. | 46.56 ft | on 02-04-1998 | |
| 14. | 48.50 ft | on 01-02-1997 | |
| 15. | 31.30 ft | on 11-27-1989 | |
| 16. | 42.30 ft | on 03-26-1989 | |
| 17. | 34.60 ft | on 01-18-1988 | |
| 18. | 37.00 ft | on 03-06-1987 | |
| 19. | 47.10 ft | on 02-18-1986 | |
| 20. | 41.90 ft | on 02-09-1985 | |
| 21. | 44.64 ft | on 12-26-1983 | |
| 22. | 45.97 ft | on 03-14-1983 | |
| 23. | 49.90 ft | on 01-14-1980 | |
| 24. | 39.40 ft | on 02-21-1979 | |
| 25. | 42.10 ft | on 01-15-1978 | |
| 26. | 31.50 ft | on 02-23-1977 | |
| 27. | 31.70 ft | on 08-15-1976 | |
| 28. | 40.75 ft | on 03-26-1975 | |
| 29. | 41.80 ft | on 03-03-1974 | |
| 30. | 43.70 ft | on 01-17-1973 | |
| 31. | 38.20 ft | on 12-25-1971 | |
| 32. | 44.60 ft | on 01-22-1969 | |
| 33. | 38.90 ft | on 02-20-1968 | |
| 34. | 45.10 ft | on 01-22-1967 | |
| 35. | 37.00 ft | on 02-06-1966 | |
| 36. | 46.10 ft | on 12-23-1964 | |
| 37. | 45.52 ft | on 02-01-1963 | 1 |
| 38. | 46.26 ft | on 12-23-1955 | 1 |
| 39. | 44.90 ft | on 11-21-1950 | 1 |
| 40. | 45.90 ft | on 02-23-1936 | 1 |
Historic Crests
| 1. | 49.90 ft | on 01-14-1980 |
| 2. | 48.50 ft | on 01-02-1997 |
| 3. | 47.10 ft | on 02-18-1986 |
| 4. | 47.02 ft | on 01-01-2006 |
| 5. | 46.56 ft | on 02-04-1998 |
Historic Crests
| 1. | 49.90 ft | on 01-14-1980 | |
| 2. | 48.50 ft | on 01-02-1997 | |
| 3. | 47.10 ft | on 02-18-1986 | |
| 4. | 47.02 ft | on 01-01-2006 | |
| 5. | 46.56 ft | on 02-04-1998 | |
| 6. | 46.26 ft | on 12-23-1955 | 1 |
| 7. | 46.12 ft | on 04-05-2006 | |
| 8. | 46.10 ft | on 12-23-1964 | |
| 9. | 45.97 ft | on 03-14-1983 | |
| 10. | 45.90 ft | on 02-23-1936 | 1 |
| 11. | 45.52 ft | on 02-01-1963 | 1 |
| 12. | 45.10 ft | on 01-22-1967 | |
| 13. | 44.90 ft | on 11-21-1950 | 1 |
| 14. | 44.64 ft | on 12-26-1983 | |
| 15. | 44.60 ft | on 01-22-1969 | |
| 16. | 43.97 ft | on 01-01-2017 | |
| 17. | 43.84 ft | on 02-10-2017 | |
| 18. | 43.70 ft | on 01-17-1973 | |
| 19. | 42.98 ft | on 03-02-2024 | |
| 20. | 42.92 ft | on 03-23-2018 | |
| 21. | 42.30 ft | on 03-26-1989 | |
| 22. | 42.10 ft | on 01-15-1978 | |
| 23. | 42.04 ft | on 02-15-2019 | |
| 24. | 41.90 ft | on 03-15-2023 | |
| 25. | 41.90 ft | on 02-09-1985 | |
| 26. | 41.80 ft | on 03-03-1974 | |
| 27. | 40.75 ft | on 03-26-1975 | |
| 28. | 40.19 ft | on 03-14-2016 | |
| 29. | 39.40 ft | on 02-21-1979 | |
| 30. | 38.99 ft | on 12-24-2021 | |
| 31. | 38.90 ft | on 02-20-1968 | |
| 32. | 38.20 ft | on 12-25-1971 | |
| 33. | 38.18 ft | on 04-06-2020 | |
| 34. | 37.00 ft | on 02-06-1966 | |
| 35. | 37.00 ft | on 03-06-1987 | |
| 36. | 34.60 ft | on 01-18-1988 | |
| 37. | 32.00 ft | on 01-29-2021 | |
| 38. | 31.70 ft | on 08-15-1976 | |
| 39. | 31.50 ft | on 02-23-1977 | |
| 40. | 31.30 ft | on 11-27-1989 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 53.50 ft |
| moderate Flooding | 53.40 ft |
| minor Flooding | 44.50 ft |
| action | 38.50 ft |
| Latest Value | 25.85 ft |
| Gauge Zero | 0.00 ft |
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.