SURFACE-WATER FIELD TECHNIQUES

Clark Fork at Missoula, Montana - n = 0.030

(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 Missoula, Montana
  Station number	12-3405
  Gage location	Lat 46°52'40'', long 113°55'40'', in NW 1/4 NW 1/4 sec. 19, T. 13 N., R. 18W., on right bank 3 miles downstream from Blackfoot River and 3 miles east of Missoula. Section 1 is 405ft upstream from gage.
  Drainage area	5,999 sq mi
  Date of flood	May 23, 1948
  Gage height	13.07 ft at gage; 14.54 ft at section 1
  Peak discharge	31.500 cfs
  Computed roughness coefficient	Manning n = 0.030
  Description of channel	Bed is composed of sand, gravel, and boulders; d50 = 175 mm, d84 = 325 mm. Thick undergrowth is along right bank and along the left bank in the lower part of the reach.

  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	3,866	285	13.56	13.24	8.15	.......	.....
  2	3,461	267	12.96	12.64	9.10	305	0.63
  3	3,634	294	12.36	12.10	8.67	243	.25
  4	3,798	312	12.17	11.95	8.29	297	.18

  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 above Missoula, Montana.

• Introduction Page|| Site Description || Reach Properties

  Plan Sketch and Cross Sections || Site Photos

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Site Photos

Photo 18: Downstream along left bank from above section 3, Clark Fork above Missoula, Montana.

Photo 19: Downstream through reach from bridge 400 ft above section 1, Clark Fork above Missoula, Montana.

Introduction Page || Site Description || Reach Properties

Plan Sketch and Cross Sections || Site Photos

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