Rockwall-Forney Dam (Lake Ray Hubbard)

Field Descriptions

Dam Name: Rockwall-Forney Dam
NID ID: TX00837
Longitude: -96.5067
Latitude: 32.8017
County: KAUFMAN
River: EAST FORK TRINITY RIVER
State: TX
Nearest City: SEAGOVILLE
Distance: 10.00 miles
Owner Name: CITY OF DALLAS
Owner Type: Local Government
Dam Designer: JONES & BOYD, INC;FORREST & COTTON INC
Private Dam? No
Dam Type: Earth
Core: Homogeneous Dam (Position)
Earth (Type)
Known (Certainty)
Foundation: SK
Purposes: Water Supply
Year Completed: 1969
Year Modified/Mod Type: 1996S
Dam Length: 12500 feet
Dam Height: 68 feet
Structural Height: 68 feet
Hydraulic Height: 57 feet
Maximum Discharge: 375000 cu ft/sec
Maximum Storage: 575040 acre-feet
Normal Storage: 452040 acre-feet
Surface Area: 22745 acres
Drainage Area: 1071 square miles
Hazard Potential: High
Emergency Action Plan? Yes
Inspection Date: 2009-10-08
Inspection Frequency: 5
State Regulated Dam? Yes
State Regulating Agency: TCEQ
Spillway Type: Controlled
Spillway Width: 560 feet
Outlet Gates: T14;S3;O1
Volume of Dam: 5700000 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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