Washington Co Road Dam 3-74-7 is an earth dam located in Washington County, Iowa, built in 2002. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 825 ft long, taller than 82% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Washington Co Road Dam 3-74-7
The primary purpose of Washington Co Road Dam 3-74-7 is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Washington County (local government). It impounds the Tr- West Fork Crooked Creek near Coppock.
The dam stands 36 feet tall and stretches 825 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 634 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 2002, the structure is relatively new.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Iowa |
| County | Washington |
| Nearest City | Coppock |
| River/Stream | Tr- West Fork Crooked Creek |
| Coordinates | 41.24500, -91.66520 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 825 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 634 acre-ft |
| Max Storage | 634 acre-ft |
| Normal Storage | 137 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Washington County |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03870 |
| Federal ID | IA03870 |
| More Info | State Dam Safety Program |