Chiwawa River near Plain, Wash


Study Reach.--Section 1 is 90 ft downstream from gage.

Gage Location.--Lat 47°50'30", long 120°39'40", in SE1/4 sec.13, T27N., R12E., on right bank 0.5 mile upstream from Goose Creek, 6 miles north of Plain, 7 miles upstream from mouth, and 11 miles northeast of Chiwaukum.

Drainage Area.--170 sq mi.

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

Stage, Discharge Measurements and Computed n-Values.--Gage heights were 9.17 ft at gage; 9.62 ft at section 1. Peak discharges was 5,880 cfs on May 29, 1948.

Date of Observation Discharge (ft3/s) Average Cross Section Area (ft2) Hydraulic Radius (ft) Mean Velocity (ft/s) Slope Coefficient of Roughness n
5/29/1948 5884.8 766.0 5.49 7.68 0.004947 0.043

Description of Channel.--Bed generally extends to bedrock throughout reach with cover of boulders as much as 1 1/2 ft in diameter in some places. Banks are mildly sloped and have trees along the tops.

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