Blanchard Dam is an earth dam located in Lee County, Iowa, built in 2006. It carries a Low hazard potential classification.
Dam profile
NID height · 37 ft37 ft tall and 660 ft long, taller than 83% 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 Blanchard Dam
The primary purpose of Blanchard Dam 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 Donald Blanchard (private). It impounds the Trib to Skunk River near Augusta.
The dam stands 37 feet tall and stretches 660 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 70 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2006, 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 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Iowa |
| County | Lee |
| Nearest City | Augusta |
| River/Stream | Trib to Skunk River |
| Coordinates | 40.76830, -91.39720 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 660 ft |
| Year Completed | 2006 (20 years old) |
Storage & Hydraulics
| NID Storage | 70 acre-ft |
| Max Storage | 70 acre-ft |
| Normal Storage | 44 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 110 cfs |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Donald Blanchard |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04074 |
| Federal ID | IA04074 |
| More Info | State Dam Safety Program |