WSP12341

• File Number: 8111.600
• Description: ARCA Annual Reports
• Basin: Arkansas
• Date: 1/4/1982
• Author: ARCA
• Title: Thirty-Third Annual Report Arkansas River Compact Administration for the Year 1981
• Water Supply Pro - Doc Type: Annual Report

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resources of the entire Arkansas River basin. The reservoir provides
270,375 acre-feet of storage capacity for flood control. It protects the
fertile Arkansas River Valley helow the dam from floods originating in
the 18,915 square miles of the Arkansas River hasin ahove the dam. It
provides 350,951 acre-feel of storage space for conservation and
recreation. John Martin Reservoir supplies water to the irrigated lands
below the dam as far as Garden City, Kansas. The top of the con-
servation pool is 3,851 feet above mean sea level. which provides
350,951 acre-feet of storage for irrigation. The release of stored flood
waters in excess of the conservation and recreation pools and above
elevation 3,851 feet is planned so that, when combined with nows
originating downstream from the dam, the capacity of the chaMel will
not be excceded. Upon request of the Arkansas River Compact
Administration, irrigation water for downstream water users is
released through the outlet works in the hase of the dam. Downstream
flood damages prevented hy John Martin dam already exceed the cost
of the project. Benefits have already passed the $92 million mark.
Recreation and favorable fish and wildlife habitats are derived from
this project. With reservoir lands open to all, there are many attractive
public use areas for outdoor recreation, water sports, fishing- and
boating, or just relaxed hving. During construction some embankment
material was obtained from a 75-acre tract of land immediately
downstream of the dam. This excavated area, averaging 12 feet deep,
filled with water and formed Lake Hasty, the center of year-round
recreation.
John Martin Dam consists of a concrete gravity structure 1,644 feet
long and 120 feet high, and an earthfill structure 2,600 feet long. The
cnncrete gravity structure contains a gated spillway provided with
sixteen 30 feet by 64 feet tainter gates with their operating machinery.
There are earthen wing dams on either side of the main dam. The
north wing dam is 3,880 feet long, connecting to the earthfill structure
of the main dam at the north abutment. The south wing dam is 5,807
feet long and connects to the south end of the concrete structure of the
main dam. A bituminous-surfaced roadway, 21 feet wide, extends along
the crest of the north wing dam, main dam, and south wing dam. The
overall length of the structure is 2.6 miles. Detailed project data are
shown below.
DAM
Total length, feet.
Maximum height ahove streambed, feet.
Width of roadway on dam, feet.

13,945
118
21

SPILLWAY
Total length, including piers, feet.
Crcst gates, 30' x 64' .
Discharge capacity, cubic feet per second.

1,174
16
......... .639,200

OUTLET WORKS
Sluicing conduits, 6' x 7\>'
Regulating conduits, 4' x 4' .

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