Riordan Dam
Riordan Dam is an earth dam located in Monroe County, Iowa, built in 1967. It carries a Low hazard potential classification.
About Riordan Dam
The primary purpose of Riordan 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 Patrick M Riordan (private). It impounds the Tr-cedar Creek near Tyrone.
The dam stands 22 feet tall and stretches 403 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
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.
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Location
| State | Iowa |
| County | Monroe |
| Nearest City | Tyrone |
| River/Stream | Tr-cedar Creek |
| Coordinates | 40.92960, -93.00900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 403 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 26 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Patrick M Riordan |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00806 |
| Federal ID | IA00806 |
| More Info | State Dam Safety Program |