Rivers in Alaska
Tonsina River at the Richardson Hwy near Tonsina
Below flood stage
7.79ftStage
Observed Sat, Oct 3, 5:36 PM UTC
- Flood stage
- 12.50 ft
- Forecast crest
- 7.75 ftSun, Oct 4, 12:00 AM UTC
- Record crest
- 14.57 ft2006
Flood stages and impacts
| Category | Stage |
|---|---|
| Moderate flood | 13.00 ft |
| Minor flood | 12.50 ft |
| Action | 11.50 ft |
- 25.50 ftBridge Low Cord
- 12.00 ftHigh water level -- Class IV whitewater in Tonsina River canyon
- 11.50 ftBankfull -- stage associated with a flow (5100 cfs) having a recurrence interval of ~2 years
- 10.00 ftMedium water level -- Class III+ whitewater in Tonsina River canyon
- 9.00 ftLow water level -- Class III whitewater in Tonsina River canyon
Flood outlook
Chance of flooding, October to December
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| Moderate flooding | Under 5% |
| Major flooding | -99900% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued October 1, 2026.
Crest history
32 crests on NOAA’s list since 1984.
| # | Date | Stage |
|---|---|---|
| 1 | October 11, 2006 | 14.57 ft |
| 2 | June 30, 2000 | 13.44 ft |
| 3 | June 25, 2001 | 13.23 ft |
| 4 | September 22, 1995 | 13.00 ft |
| 5 | June 9, 1998 | 13.00 ft |
| 6 | July 5, 1992 | 12.81 ft |
| 7 | July 7, 1988 | 12.75 ft |
| 8 | July 4, 1985 | 12.60 ft |
| 9 | June 18, 1994 | 12.50 ft |
| 10 | June 8, 1990 | 12.45 ft |
| 11 | July 7, 1986 | 12.40 ft |
| 12 | June 19, 1999 | 12.26 ft |
| 13 | July 7, 1987 | 12.26 ft |
| 14 | June 23, 1991 | 12.22 ft |
| 15 | June 5, 1993 | 12.18 ft |
| 16 | June 20, 2005 | 12.17 ft |
| 17 | June 25, 1984 | 12.16 ft |
| 18 | June 25, 2012 | 12.15 ft |
| 19 | August 14, 1997 | 12.05 ft |
| 20 | July 3, 1989 | 11.95 ft |
| 21 | June 25, 2002 | 11.93 ft |
| 22 | July 9, 2004 | 11.69 ft |
| 23 | June 16, 2003 | 11.54 ft |
| 24 | June 27, 1996 | 11.25 ft |
| 25 | August 12, 2007 | 11.07 ft |
Most recent crests
- June 21, 2021: 10.50 ft
- June 12, 2017: 10.27 ft
- June 21, 2016: 10.59 ft
- June 25, 2012: 12.15 ft
- June 5, 2011: 10.88 ft
- June 4, 2010: 10.35 ft
- June 8, 2009: 10.59 ft
- June 22, 2008: 11.00 ft
- August 12, 2007: 11.07 ft
- October 11, 2006: 14.57 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Alaska Pacific River Forecast Center. Forecasts are issued routinely during the warm season, and as needed at other times of the year. Stage may be affected by ice. Gage data do not meet the quality standards of USGS gages.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.