Blackfoot River near Ovando, Mont


Study Reach.--Section 1 is about 0.25 mile upstream from gage.

Gage Location.--Lat 47°01'10", long 113°13'40", in SE1/4 NW1/4 sec.34, T.15N., R.13W.,on left bank 0.25 mile upstream from Monture Creek and 5 miles west of Ovando.

Drainage Area.--1,274 sq mi.

Gage Datum and Elevations of Reference Points.--Not available.

Stage, Discharge Measurements and Computed n-Values.--Gage height were 6.84 ft at gage; 16.34 ft at section 1. Peak discharge was 8,200 cfs on May 22, 1948.

Date of Observation Discharge (ft3/s) Average Cross Section Area (ft2) Hydraulic Radius (ft) Mean Velocity (ft/s) Slope Coefficient of Roughness n
5/22/1948 8212.1 1185.0 6.05 6.93 0.002329 0.031

Description of Channel.--Bed is gravel and boulders; d50 = 155 mm, d84 = 280 mm. Banks consist of same material and are relatively free of vegetation.

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Page Last Modified: December 19, 2012