Tonsina River at the Richardson Hwy near Tonsina
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
- Upstream gauge unavailableDownstream 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) 06/27/2025 8:00 AM AKDTOfficial Forecast (FCST) 06/26/2025 12:58 PM AKDTCATEGORY STAGE 
Moderate Flooding 13 ft Minor Flooding 12.5 ft Action 11.5 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely during the warm season, and as needed at other times of the year.
Gage data do not meet the quality standards of USGS gages.
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
- 25.5 - Bridge Low Cord
- 12 - High water level -- Class IV whitewater in Tonsina River canyon
- 11.5 - Bankfull -- stage associated with a flow (5100 cfs) having a recurrence interval of ~2 years
Gauge Info
| Coordinates | 61.6614, -145.184 |
| RFC | APRFC |
| State | AK |
| WFO | AFC |
| County | Valdez-Cordova |
| Data Provider(s) | |
| National Weather Service | Alaska-Pacific River Forecast Center |
Gauge Location
Recent Crests
| 1. | 10.50 ft | on 06-21-2021 | |
| 2. | 10.27 ft | on 06-12-2017 | (P) |
| 3. | 10.59 ft | on 06-21-2016 | (P) |
| 4. | 12.15 ft | on 06-25-2012 | (P) |
| 5. | 10.88 ft | on 06-05-2011 |
Recent Crests
| 1. | 10.50 ft | on 06-21-2021 | |
| 2. | 10.27 ft | on 06-12-2017 | (P) |
| 3. | 10.59 ft | on 06-21-2016 | (P) |
| 4. | 12.15 ft | on 06-25-2012 | (P) |
| 5. | 10.88 ft | on 06-05-2011 | |
| 6. | 10.35 ft | on 06-04-2010 | |
| 7. | 10.59 ft | on 06-08-2009 | |
| 8. | 11.00 ft | on 06-22-2008 | |
| 9. | 11.07 ft | on 08-12-2007 | |
| 10. | 14.57 ft | on 10-11-2006 | (P) |
| 11. | 12.17 ft | on 06-20-2005 | |
| 12. | 11.69 ft | on 07-09-2004 | |
| 13. | 11.54 ft | on 06-16-2003 | |
| 14. | 11.93 ft | on 06-25-2002 | |
| 15. | 13.23 ft | on 06-25-2001 | |
| 16. | 13.44 ft | on 06-30-2000 | |
| 17. | 12.26 ft | on 06-19-1999 | |
| 18. | 13.00 ft | on 06-09-1998 | |
| 19. | 12.05 ft | on 08-14-1997 | |
| 20. | 11.25 ft | on 06-27-1996 | |
| 21. | 13.00 ft | on 09-22-1995 | |
| 22. | 12.50 ft | on 06-18-1994 | |
| 23. | 12.18 ft | on 06-05-1993 | |
| 24. | 12.81 ft | on 07-05-1992 | |
| 25. | 12.22 ft | on 06-23-1991 | |
| 26. | 12.45 ft | on 06-08-1990 | |
| 27. | 11.95 ft | on 07-03-1989 | |
| 28. | 12.75 ft | on 07-07-1988 | |
| 29. | 12.26 ft | on 07-07-1987 | |
| 30. | 12.40 ft | on 07-07-1986 | |
| 31. | 12.60 ft | on 07-04-1985 | |
| 32. | 12.16 ft | on 06-25-1984 |
Historic Crests
| 1. | 14.57 ft | on 10-11-2006 | (P) |
| 2. | 13.44 ft | on 06-30-2000 | |
| 3. | 13.23 ft | on 06-25-2001 | |
| 4. | 13.00 ft | on 09-22-1995 | |
| 5. | 13.00 ft | on 06-09-1998 |
Historic Crests
| 1. | 14.57 ft | on 10-11-2006 | (P) |
| 2. | 13.44 ft | on 06-30-2000 | |
| 3. | 13.23 ft | on 06-25-2001 | |
| 4. | 13.00 ft | on 09-22-1995 | |
| 5. | 13.00 ft | on 06-09-1998 | |
| 6. | 12.81 ft | on 07-05-1992 | |
| 7. | 12.75 ft | on 07-07-1988 | |
| 8. | 12.60 ft | on 07-04-1985 | |
| 9. | 12.50 ft | on 06-18-1994 | |
| 10. | 12.45 ft | on 06-08-1990 | |
| 11. | 12.40 ft | on 07-07-1986 | |
| 12. | 12.26 ft | on 07-07-1987 | |
| 13. | 12.26 ft | on 06-19-1999 | |
| 14. | 12.22 ft | on 06-23-1991 | |
| 15. | 12.18 ft | on 06-05-1993 | |
| 16. | 12.17 ft | on 06-20-2005 | |
| 17. | 12.16 ft | on 06-25-1984 | |
| 18. | 12.15 ft | on 06-25-2012 | (P) |
| 19. | 12.05 ft | on 08-14-1997 | |
| 20. | 11.95 ft | on 07-03-1989 | |
| 21. | 11.93 ft | on 06-25-2002 | |
| 22. | 11.69 ft | on 07-09-2004 | |
| 23. | 11.54 ft | on 06-16-2003 | |
| 24. | 11.25 ft | on 06-27-1996 | |
| 25. | 11.07 ft | on 08-12-2007 | |
| 26. | 11.00 ft | on 06-22-2008 | |
| 27. | 10.88 ft | on 06-05-2011 | |
| 28. | 10.59 ft | on 06-21-2016 | (P) |
| 29. | 10.59 ft | on 06-08-2009 | |
| 30. | 10.50 ft | on 06-21-2021 | |
| 31. | 10.35 ft | on 06-04-2010 | |
| 32. | 10.27 ft | on 06-12-2017 | (P) |
Vertical Datum Table
| type | STND | NGVD29 |
|---|---|---|
| major Flooding | N/A | N/A |
| moderate Flooding | 13.00 ft | 1513.00 ft |
| minor Flooding | 12.50 ft | 1512.50 ft |
| action | 11.50 ft | 1511.50 ft |
| Latest Value | 10.03 ft | 1510.03 ft |
| Gauge Zero | 0.00 ft | 1500.00 ft |
Unique Local Info
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.