Blackfoot River level at Bonner
Montana · Tubing & floating
Measured at USGS 12340000 — Blackfoot River near Bonner MT · NWS forecast point BONM8
Reading taken · as of 33 min ago
Right around its normal summer float level
At 764 CFS, this gauge is running 117% of normal for mid-September — above the 655 CFS median USGS has recorded for this date across 93 years of record (1898–2026).
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Flood stages at Bonner
National Weather Service categories for gauge BONM8, WFO MSO. Impact wording is the NWS's own, verbatim.
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Major flood 17.0 ft
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Moderate flood 16.0 ft
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Minor flood 10.0 ft
- 10.0 ft Flooding to low lying areas adjacent to the river is possible.
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Action 9.5 ft
- Right now 2.34 ft
NWS forecast: 2.50 ft by .
Flow history at Bonner
Daily values from USGS 12340000, updated every 15 to 60 minutes; NWS forecast for BONM8 reissued through the day. Provisional.
Highest crests on record at Bonner
12 on record
| Stage | Flow | Date |
|---|---|---|
| 16.00 ft | — | Feb 9, 1996 |
| 11.65 ft | — | Jun 4, 1953 |
| 11.09 ft | 18,800 CFS | May 11, 2018 |
| 10.89 ft | 19,200 CFS | Jun 10, 1964 |
| 10.74 ft | 18,100 CFS | Jun 20, 1975 |
| 10.50 ft | 16,144 CFS | May 18, 1997 |
| 10.01 ft | 17,000 CFS | Jun 9, 2011 |
| 9.98 ft | 6,500 CFS | Jun 2, 1972 |
| 9.48 ft | 13,140 CFS | Jun 15, 1976 |
| 8.78 ft | 11,290 CFS | May 14, 1971 |
Crests published by the National Weather Service.
About Blackfoot River at Bonner
In Montana — the reading paddlers, anglers and outfitters here check before committing to a shuttle. Johnsrud Park; Missoula's biggest summer float.
Blackfoot River at Bonner — common questions
3 questions
Does rain upstream change Blackfoot River at Bonner quickly?
Yes. It is free-flowing, so rain upstream moves it directly. Several feet in a few hours is normal after a heavy storm.
Is Blackfoot River at Bonner high or low for this time of year?
The USGS median flow for mid-September here is 655 CFS, from 93 years of record (1898–2026). Today is 117% of it. The comparison is what makes the raw number mean anything: the same reading is a drought on one river and a flood on another.
How often does this reading update?
USGS transmits from gauge 12340000 every 15 to 60 minutes, and the National Weather Service reissues the flood forecast for BONM8 a few times a day — more often when the river is rising. This page refreshes from both when you open it. The timestamp is in the gauge's local time.