Topography and Sedimentation Characteristics of the Squaw Creek ...

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Squaw Creek and Davis Creek Sediment Loads 27 Table 3. Squaw Creek National Wildlife Refuge soil sample characteristics—Continued [no., number; UTM, Universal Transverse Mercator; m, meters; ft, feet; lb/ft 3 , pounds per cubic foot; >, greater than; mm, millimeters; 0.053 mm) Percent silt (0.05–0.002 mm) Percent clay (
ELEVATION, I 864 862 860 858 856 854 852 0 2 4 6 INUNDATED AREA, IN HUNDREDS OF ACRES 860 859 858 857 856 855 854 853 852 0 5 10 15 CAPACITY, IN HUNDREDS OF ACRE-FEET Figure 9. Elevation-area and elevation-capacity data for Mallard North and Mallard South at the Squaw Creek National Wildlife Refuge. was 957 ft 3 /s (cubic feet per second) compared with a 19-year mean of 971 ft 3 /s (Hauck and Nagel, 2002). The 2002 total sediment load from the Squaw Creek Basin was about 11,000 tons, and the 2002 Davis Creek Basin total sediment load was about 690 tons. The 2002 yield from the Squaw Creek Basin (0.27 tons/acre) also exceeded that of the Davis Creek Basin (0.05 tons/acre). The 2002 water year streamflow in the region was substantially below average based on the 2002 Nodaway River near Graham, Missouri, mean annual flow of 192 ft 3 /s (Hauck and Nagel, 2003). Davis Creek had higher maximum suspendedsediment concentrations than Squaw Creek as a result of lower streamflows in combination with possibly higher erosion rates in the Davis Creek Basin. In comparison the greater streamflows in Squaw Creek resulted in greater sediment loads despite lower maximum concentrations. The measured suspended-sedi- EXPLANATION HISTORIC DATA—Data from the U.S. Fish and Wildlife Service (1964) 1937 1964 RECENT DATA 2002 ment concentrations from Squaw Creek near Mound City, during the 2001 and 2002 water years, varied from 46 to about 26,000 mg/L (milligrams per liter). The range in concentrations from Davis Creek near Mound City for the same period varied from 46 to about 72,500 mg/L. The mean annual flows for Squaw and Davis Creeks in 2001 were 36.0 and 15.9 ft 3 /s, respectively. The 2002 mean annual flows for Squaw and Davis Creeks were 13.1 and 4.5 ft 3 /s, respectively (Hauck and Nagel, 2003). The combined sediment load from Squaw and Davis Creeks during a water year of average flow (2001) was 76,200 tons, while the mean deposition mass in the Refuge (2002 surveyed area) from 1937 to 1964 was 241,000 tons/yr (tons per year) and 101,000 tons/yr from 1964 to 2002 (table 2). The higher deposition mass in 1937 to 1964 compared with 1964 to 2002 is likely the result of erosion-control management 28 Topography and Sedimentation Characteristics of the Squaw Creek National Wildlife Refuge, Holt County, Missouri, 1937–2002
Page 1 and 2: Prepared in cooperation with the U.
Page 3 and 4: U.S. DEPARTMENT OF THE INTERIOR GAL
Page 5 and 6: FIGURES 1.- 8. Maps showing: 1. Loc
Page 7 and 8: Squaw Creek and Davis Creek inflow
Page 9 and 10: (1,096 ft) to the north Refuge boun
Page 11 and 12: ican Datum of 1983 (NAD 83) horizon
Page 13 and 14: 8 Topography and Sedimentation Char
Page 15 and 16: TOPOGRAPHY AND SEDIMENTATION CHARAC
Page 17 and 18: 40°06' 855 857 Mallard North 853 8
Page 19 and 20: emain in suspension for longer time
Page 21 and 22: Todd Ditch Porter Creek 95°16' Nor
Page 23 and 24: Sediment Deposition, 1937 to 2002 T
Page 25 and 26: Todd Ditch Porter Creek 95°16' Nor
Page 27: 26 Topography and Sedimentation Cha
Page 31 and 32: ELEVATION, IN FEET ABOVE NGVD 29 85
Page 33 and 34: (acre-feet per year). For 1964 to 2
Page 35 and 36: Table 4 35 Table 4. Elevation/stage
Page 53: Heimann and Richards—Topography a

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