SURFACE-WATER FIELD TECHNIQUES

Clark Fork at St. Regis, Montana - n = 0.028

(Source: U.S.G.S Water Supply Paper 1849)
 

Site Description

Reach properties

Plan sketch and cross sections

Site photos

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Site Description

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  Station name	Clark Fork at St. Regis, Montana
  Station number	12-3545
  Gage location	Lat 47°18'05'', long 115°05'15'', in center of SW 1/4 sec. 19, T. 18 N., R. 27 W., on left bank at St. Regis. 0.5 mile downstream from St. Regis River. Section 1 is 660 ft upstream from gage.
  Drainage area	10,709 sq mi
  Date of flood	May 24, 1948
  Gage height	19.96 ft at gage: 20.42 ft at section 1
  Peak discharge	68,900 cfs
  Computed roughness coefficient	Manning n = 0.028
  Description of channel	Bed consists of well-rounded boulders; d50 = 135 mm, d84 = 205 mm. Banks are composed of gravel and boulders, and have tree and brush cover.

  Introduction Page || Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Reach Properties

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  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	6,860	404	16.98	16.70	10.04	.......	.....
  2	6,976	429	16.26	16.04	9.88	755	0.555
  3	7,194	454	15.85	15.64	9.58	438	.32

  Introduction Page || Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Plan Sketch and Cross Sections

Plan sketch and cross sections, Clark Fork at St. Regis, Montana.

• Introduction Page|| Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Site Photos

Photo 22: Downstream along right bank from section 2, Clark Fork at St. Regis, Montana.

Photo 23: Upstream along left bank from section 2, Clark Fork at St. Regis, Montana.

Introduction Page || Site Description || Reach Properties

Plan Sketch and Cross Sections || Site Photos

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