El Dorado Lake

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El Dorado Lake
El Dorado Lake KS.jpg
Aerial photo of El Dorado Lake and vicinity, facing northwest (2011)
Map of Butler Co, Ks, USA.png
Location Butler County, Kansas
Coordinates 37°50′50″N 96°49′23″W / 37.84722°N 96.82306°W / 37.84722; -96.82306Coordinates: 37°50′50″N 96°49′23″W / 37.84722°N 96.82306°W / 37.84722; -96.82306
Type Reservoir
Primary inflows Walnut River
Primary outflows Walnut River
Catchment area 247 sq mi (640 km2)
Basin countries United States
Managing agency U.S. Army Corps of Engineers
Built October 1973 (1973-10)
First flooded June 1981 (1981-06)
Surface area 8,000 acres (32 km2)
Max. depth 60 ft (18 m)[1]
Water volume Full: 158,189 acre·ft (195,123,000 m3)
Current (Nov. 2015): 150,702 acre·ft (185,888,000 m3)[2]
Shore length1 98 miles (158 km)
Surface elevation Full: 1,339 ft (408 m)
Current (Nov. 2015): 1,338 ft (408 m)[2]
Settlements El Dorado
References [3]
1 Shore length is not a well-defined measure.

El Dorado Lake is a reservoir on the Walnut River, 0.5 miles (0.80 km) north-east of El Dorado, in the Flint Hills region of Kansas. The lake is part of El Dorado State Park.


The Flood Control Act of 1965 authorized construction of El Dorado Lake.[4] The U.S. Army Corps of Engineers held groundbreaking ceremonies in September 1973, and construction began the following month.[4][5] The reservoir became fully operational for flood control June 29, 1981.[4]

Construction of El Dorado Lake incorporated two pre-existing smaller reservoirs: Bluestem Lake and the original El Dorado Lake.[6] The original El Dorado Lake was built on Satchel Creek in 1927 as a water supply for the community of El Dorado. Bluestem Lake was built on Bemis Creek in the 1950s. The dams of both reservoirs were breached during the building of the larger El Dorado Lake and their waters subsequently inundated.[4] The remnants of Bluestem Lake's dam are still visible in the Shady Creek arm of the present-day reservoir.[6]


El Dorado Lake is located at 37°50′50″N 96°49′23″W / 37.84722°N 96.82306°W / 37.84722; -96.82306 (37.8472402, -96.8230838) at an elevation of 1,335 feet (407 m).[3] It lies in the Flint Hills in south-central Kansas.[7] The entirety of the reservoir lies within Butler County.[8]

The reservoir is impounded at its southwestern end by El Dorado Lake Dam.[8][9] The Walnut River is both the reservoir's primary inflow from the north and outflow to the southwest. Smaller tributaries include: Gilmore Branch and Cole Creek from the north, Durechen Creek from the northeast, and Satchel Creek, Bemis Creek, and Shady Creek from the east.[8]

The Kansas Turnpike (Interstate 35) runs northeast-southwest across the northern end of the lake and then parallel to its northwestern shore. U.S. Route 77 runs north-south west of the reservoir, and U.S. Route 54 runs east-west 1.5 miles (2.4 km) south of the reservoir. Kansas Highway 177 runs north-south across the lake's eastern arms.[8] Boulder Bluff Road, a paved county road, runs around the dam to the south, connecting with Shady Creek Access Road, another paved county road, which runs east-west immediately south of the reservoir.[8][10]

The reservoir's namesake, the city of El Dorado, is located just southwest of the dam.[8]


The surface area, surface elevation, and water volume of the reservoir fluctuate based on inflow and local climatic conditions. In terms of capacity, the Corps of Engineers vertically divides the reservoir into a set of pools based on volume and water level, and the reservoir is considered full when filled to the capacity of its conservation pool. When full, El Dorado Lake has a surface area of 8,000 acres (32 km2), a surface elevation of 1,339 feet (408 m), and a volume of 158,189 acre feet (195,123,000 m3).[2] When filled to maximum capacity, it has a surface area of 10,700 acres (43 km2), a surface elevation of 1,347.5 feet (410.7 m), and a volume of 240,660 acre feet (296,850,000 m3).[2][5]

The streambed underlying the reservoir has an elevation of 1,271.5 feet (387.6 m).[2]


El Dorado Lake Dam is a rolled earth-fill embankment dam that stands 99 feet (30 m) above the streambed and 20,930 feet (6,380 m) long.[5] At its crest, the dam has an elevation of 1,370.5 feet (417.7 m).[2] An uncontrolled, 350-foot (110 m) spillway is located near the northwest end of the dam.[5][10] Additional outlet works include an 11.5-foot (3.5 m) by 15.75-foot (4.80 m) oval conduit. The estimated peak discharge capacity is 41,200 cubic feet per second (1,170 m3/s).[5]


The Kansas Department of Wildlife, Parks and Tourism (KDWP) manages 4,500 acres (18 km2) of park lands and 3,500 acres (14 km2) of wildlife area.

Recreation areas[edit]

The park consists of four primary campgrounds which include the following amenities: a full-service marina; a sailing club; approximately 1000 campsites, some with utilities some without; picnic shelters; rental cabins; trails for horses, hiking and bicycles; swim beaches; shower houses and restrooms; ADA playgrounds; boat ramps and a laundry facility.


Zebra mussel veligers (larval zebra mussels) are too small to be seen with the unaided eye and they can be found in boat livewells, minnow buckets, boat bilges, water toys and anything else that is capable of holding even a small amount of water.

See also[edit]


  1. ^ "El Dorado Reservoir Fishing Information". Kansas Department of Wildlife, Parks and Tourism. Retrieved 2015-11-23. 
  2. ^ a b c d e f "EDRK1: El Dorado Lake". U.S. Army Corps of Engineers. Retrieved 2015-11-23. 
  3. ^ a b Geographic Names Information System (GNIS) details for El Dorado Lake; United States Geological Survey (USGS); July 1, 1984.
  4. ^ a b c d "Bathymetric and Sediment Survey of El Dorado Reservoir, Butler County, Kansas" (PDF). Kansas Biological Survey. May 2012. Retrieved 2015-11-24. 
  5. ^ a b c d e "El Dorado Lake - Pertinent Data". U.S. Army Corps of Engineers. Retrieved 2015-11-23. 
  6. ^ a b "El Dorado Lake - History". U.S. Army Corps of Engineers. Retrieved 2015-11-24. 
  7. ^ "2003-2004 Official Transportation Map" (PDF). Kansas Department of Transportation. Retrieved 2015-11-23. 
  8. ^ a b c d e f "General Highway Map - Butler County, Kansas". Kansas Department of Transportation. Retrieved 2015-11-23. 
  9. ^ "El Dorado Lake Dam". Geographic Names Information System. United States Geological Survey. Retrieved 2015-11-23. 
  10. ^ a b "El Dorado Reservoir". Google Maps. Retrieved 2015-11-23. 

External links[edit]