Medina Lake Dam (Lake Medina)

Field Descriptions

Dam Name: Medina Lake Dam
NID ID: TX01787
Longitude: -98.9333
Latitude: 29.5403
County: MEDINA
River: MEDINA RIVER
State: TX
Nearest City: RIO MEDINA
Distance: 12.00 miles
Owner Name: BEXAR MEDINA ATASCOSA COUNTIES WCID 1
Owner Type: Local Government
Dam Designer: BARTLETT AND RANNEY
Private Dam? No
Dam Type: Gravity
Core: Unlisted/Unknown (Position)
Known (Certainty)
Foundation: SZ
Purposes: Irrigation
Year Completed: 1913
Dam Length: 1550 feet
Dam Height: 165 feet
Structural Height: 165 feet
Hydraulic Height: 165 feet
Maximum Discharge: 658346 cu ft/sec
Maximum Storage: 327250 acre-feet
Normal Storage: 254843 acre-feet
Surface Area: 5575 acres
Drainage Area: 634 square miles
Hazard Potential: High
Emergency Action Plan? Yes
Inspection Date: 2012-07-26
Inspection Frequency: 0
State Regulated Dam? Yes
State Regulating Agency: TCEQ
Spillway Type: Uncontrolled
Spillway Width: 880 feet
Outlet Gates: V5;U1
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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