Diamond Lake Watershed Site B-8 is an earth dam located in Poweshiek County, Iowa, built in 1971. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 27 ft27 ft tall and 438 ft long, taller than 59% 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 Diamond Lake Watershed Site B-8
The primary purpose of Diamond Lake Watershed Site B-8 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Poweshiek County Swcd (local government). It impounds the Tr-moon Creek near Montezuma.
The dam stands 27 feet tall and stretches 438 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 45 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1971, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/23/2022.
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Location
| State | Iowa |
| County | Poweshiek |
| Nearest City | Montezuma |
| River/Stream | Tr-moon Creek |
| Coordinates | 41.61060, -92.55340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 438 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Poweshiek County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/23/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00964 |
| Federal ID | IA00964 |
| More Info | State Dam Safety Program |