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RIVERBETA · field sheet

Whitaker Bridge to Johnsrud Park

Blackfoot River
ClassII-III
Length5.9 mi
Gradient
On-water≈ 3 hrs
SeasonMay–September
FlowNO
USGS 12340000 · Blackfoot River near Bonner, MT
858cfs
steady over 24h · gauge 2.44 ft · water 64°F
44th percentile — about normal for the date · median ~902 cfs
Prime range 1,500–6,000 cfs
Flow at put-in today: cfs
On the water
Areas Of Smoke · Monday
Water64°F
Air73°F
Precip6%
Wind3 to 7 mph WSW
Sunrise6:18 AM
Sunset9:06 PM

NO Very low at 858 CFS — boney and likely unrunnable. · Conditions as of Aug 3, 2026, 3:30 AM. Printed snapshot generated Aug 3, 2026, 4:44 AM— conditions change, wood moves, levels swing. Verify the gauge and scout anything you can't read from upstream.

Mile by mile

  • 1RM 17Thibodeau RapidII-III About two miles below Whitaker Bridge by American Whitewater's prose (their POI math says closer to a mile and a half). Large rock right-center as the river drops; safest route on the right (Big Sky Fishing). FWP's float map grades it Class II. Flow-dependent.
  • 2RM 12.8The LedgeII A surf wave a quarter mile above Johnsrud that comes in when spring water is up — parking directly above and across the road, popular for park-and-play laps (American Whitewater).
Whitaker Bridge to Johnsrud Park river map
Pput-in · Whitaker BridgeTtake-out · Johnsrud Park#numbered rapids — see mile by mile

Getting there & back

Put-in

Whitaker BridgeConcrete ramp and toilet halfway down Johnsrud Park Road (rutted and rocky — give it time). Day use. American Whitewater calls it 'a common put in for whitewater paddlers seeking the most bang for their buck.'

Take-out

Johnsrud ParkThe largest site on the river and the downstream end of the Recreation Corridor — concrete ramp, drinking water, toilets, and a reservable group picnic shelter (406-542-5500). Day use; closed in winter. On hot summer days it is a full-on beach scene, and the take-out gets very busy.

Shuttle (take-out → put-in): 5.9 mi · ≈ 22 min

Trip log

Date
Party / boats
On the water
Off the water
Flow at launch
Shuttle / keys
Wood, hazards & notes

Spot wood or a changed rapid? Add it to the run page when you're back in coverage — riverbeta.app/blackfoot-river/blackfoot-whitaker-to-johnsrud — the next crew is counting on you.