John T Montford Dam (Lake Alan Henry)

Field Descriptions

Dam Name: John T Montford Dam
NID ID: TX06464
Longitude: -101.0417
Latitude: 33.0614
County: GARZA
River: DOUBLE MOUNTAIN FORK BRAZOS R
State: TX
Nearest City: FLAT TOP
Distance: 64.00 miles
Owner Name: CITY OF LUBBOCK
Owner Type: Local Government
Dam Designer: FREESE AND NICHOLS
Private Dam? No
Dam Type: Earth
Core: Core (Position)
Earth (Type)
Known (Certainty)
Foundation: SZ
Purposes: Irrigation
Year Completed: 1994
Dam Length: 4150 feet
Dam Height: 141 feet
Structural Height: 141 feet
Hydraulic Height: 137 feet
Maximum Discharge: 363480 cu ft/sec
Maximum Storage: 354500 acre-feet
Normal Storage: 115937 acre-feet
Surface Area: 2884 acres
Drainage Area: 394 square miles
Hazard Potential: High
Emergency Action Plan? Yes
Inspection Date: 2011-06-16
Inspection Frequency: 0
State Regulated Dam? Yes
State Regulating Agency: TCEQ
Spillway Type: Uncontrolled
Spillway Width: 1740 feet
Outlet Gates: U2;O1
Volume of Dam: 20155167 cubic yards
Source Agency:

Dam Safety For Boats

A large amount of water can be released from a dam without any warning at any time and by any means. For example, when the demand for electricity is high, the turbines at a dam may be turned on automatically, resulting in a significant increase in the downstream flow of water in only a matter of seconds.

If there's a need to release water through the sluiceways (outlets at the base of the dam), this operation can also create a great swell of discharged water downstream.

During flood operations, any or all spillway gates across the width of a dam can be opened to release upstream flood water that needs to pass to the next downstream reservoir. Upstream or downstream, even the most experienced boater with the strongest motor is no match for this strong flow of water plunging over a spillway of a dam. Even if you're boating far downstream of a spilling dam, recirculating current can pull a powerful boat upstream toward plunging water that could shred any boat.

Some dams equipped with navigation locks create turbulent water as well. When vessels pass through, strong flow is released near the exhaust ports of the wing wall of the lock.

Warning Systems At Dams

To warn reservoir users of potential danger, warning devices are installed at many dams:




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