Shryock Dam
Shryock Dam is an earth dam located in Polk County, Iowa, built in 1963. It carries a Significant hazard potential classification and has a fair condition assessment.
About Shryock Dam
The primary purpose of Shryock Dam 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 Jeffrey Rains (private). It impounds the Tr-beaver Creek near Johnston.
The dam stands 30 feet tall and stretches 522 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 34 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1963, 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 10/30/2024.
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Location
| State | Iowa |
| County | Polk |
| Nearest City | Johnston |
| River/Stream | Tr-beaver Creek |
| Coordinates | 41.70730, -93.75710 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 522 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 34 acre-ft |
| Max Storage | 34 acre-ft |
| Normal Storage | 20 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 | Jeffrey Rains |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/30/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00922 |
| Federal ID | IA00922 |
| More Info | State Dam Safety Program |