Lake Conroe Quick Facts

The Dam:

Type: Earth Filled
Year completed: 1973
Outlet structures: two concrete outlets, one service spillway, and one service outlet
Service spillway: five gates, 40 feet wide and 30 feet high, utilized for floodwater releases.
Service outlet: 3 gates with a 10 foot diameter conduit utilized for releasing water downstream (Lake Houston)
Top of dam elevation: 212 feet above mean sea level
Width of Dam: 2.2 miles (11,280 feet)
Maximum height: 82 feet
Maximum gate opening: approximately 20 feet
Maximum possible release: 110,000 cubic feet per second
Highest gate opening in history: 6 feet on October 19, 1994

The Lake:

Surface acres: 19,640
Drainage area: Approximately 450 square miles
Shoreline: approximately 150 miles
Capacity: 411,022 acre feet
Average depth: 20 feet
Normal pool: 201 feet above mean sea level
Maximum release in history: 33,000 cubic feet per second on October 19, 1994
Flowage easement: (area we can raise the lake up to during a flood event) 207 feet above mean sea level
Highest level in history: 205.58 on October 19, 1994
Lowest level in history: 192.68 (8.32 feet) on December 02, 2011 (previous record was 196.02 on January 12, 1989)
Average bulkhead height: elevation 203 feet above mean sea level
Annual evaporation: 48 inches per year
Maximum evaporation rate: 180 million gallons per day

1577 Dam Site Road
Conroe, Texas 77304
936.588.3111

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