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Pertinent Data

Authorization: Flood Control Act (Public Law 81-516a) approved May 17, 1950; Project Document HD 442, 80th Congress, 2d Session.  Public Law 101-253 (S1016) changed the name of Marion Lake, northwest of Marion, Kansas, to Marion Reservoir. 

Location: On the Cottonwood River, a tributary of the Grand (Neosho) River, at river mile 126.7, 3 miles northwest of Marion in Marion County, Kansas, and 46 miles north-northeast of Wichita, Kansas.

Status: Completed

Purpose: Flood control, water supply, water quality, and recreation.

History of Construction: Construction began in March 1964; embankment closure was completed in October 1967; and the project was placed in full flood control operation in February 1968.

Type of Structure: The rolled earth-filled embankment is 8,375 feet long, excluding the concrete spillway and nonoverflow sections; rises about 67 feet above the streambed; and has a 24-foot road across the embankment and spillway.

Spillway & Outlet Works: The spillway is a gate-controlled, concrete, gravity, ogee weir with a gross width of 136 feet. The spillway is located near the right abutment and connects to the embankment with two concrete nonoverflow sections 142 feet long. Three 40- by 40-foot tainter gates control flows through the spillway. Maximum discharge is 132,000 cubic feet per second. Two 24-inch-diameter pipes are located through the left nonoverflow section; one for low flow and the other for municipal and industrial water supply connections. Channel capacity of the stream at the dam site is 6,000 cfs.

Hydrologic Data: The flood of record occurred in June and July 1951 with a peak discharge of 54,000 cfs and a volume of 78,950 acre-feet which is equivalent to 7.40 inches of runoff from the drainage area above the dam site.

Pertinent Lake Data:

Watershed.....................................200 square miles

Shoreline.......................................60 miles

Surface acres

             Conservation pool.......... 6,210 acres

             Flood pool........................ 9,180 acres

Elevation (feet above mean sea level)

            Conservation pool........... 1,350.5

            Flood pool......................... 1,358.5

Capacity (acre-feet)

            Conservation pool............ 79,904

            Flood pool.......................... 141,802

Dam

            Length................................. 8, 375 feet

            Height above streambed. 67 feet

Outlet Works

            1 low flow pipe................... 2 feet in diameter

            1 water supply pipe........... 2 feet in diameter