Greenbriar Dam
Greenbriar Dam is an earth dam located in Dallas County, Iowa, built in 1972. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Greenbriar Dam
Greenbriar Dam is a dam in Dallas, Iowa. The dam is owned by Greenbrier Estate Lot Owners Assn (private). It impounds the Tr-raccoon River near West Des Moines.
The dam stands 52 feet tall and stretches 650 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 440 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1972, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/10/2024.
At 52 feet, this dam is taller than 93% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Dallas |
| Nearest City | West Des Moines |
| River/Stream | Tr-raccoon River |
| Coordinates | 41.51660, -93.81770 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 650 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 440 acre-ft |
| Max Storage | 440 acre-ft |
| Normal Storage | 245 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Greenbrier Estate Lot Owners Assn |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/10/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00296 |
| Federal ID | IA00296 |
| More Info | State Dam Safety Program |