Riordan Dam is an earth dam located in Monroe County, Iowa, built in 1967. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 403 ft long. 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 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
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 assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00806 |
| Federal ID | IA00806 |
| More Info | State Dam Safety Program |