SURFACE-WATER FIELD TECHNIQUES

Grande Ronde River at La Gande, Oregon - n = 0.043

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Site Description

 

Station name	Grande Ronde River at La Gande, Oregon
Station number	13-3190
Gage location	Lat 45°21', long 118°08', near center of sec. 36, T. 2 N., R. 37E., on left bank 2 miles northwest of La Grande and 5 miles downstream from Fivepoint Creek. Section 1 is 0.65 mile downstream from gage.
Drainage area	678 sq mi
Date of flood	May 22, 1948
Gage height	7.04 ft at gage; 12.95 ft (different datum) at section 1
Peak discharge	4,620 cfs
Computed roughness coefficient	Manning n = 0.043
Description of channel	Bed consists of boulders; d50 = 93 mm, d84 = 157 mm. Right bank is fairly steep and has dense overhanging bushes.

Introduction Page || Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Reach Properties

 

Section	Area (sq ft)	Top Width (ft.)	Mean depth (ft)	Hydraulic radius (ft)	Mean velocity (ft per sec)	Lenght (ft) between sections	Fall (ft) between sections
1	637	110	5.79	5.64	7.25	.......	.....
2	599	115	5.21	5.12	7.71	212	1.68
3	624	117	5.33	5.24	7.40	199	0.48

Introduction Page || Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Plan Sketch and Cross Sections

Introduction Page|| Site Description || Reach Properties
Plan Sketch and Cross Sections || Site Photos

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Site Photos