Mariposa Lake Dam is an earth dam located in Jasper County, Iowa, built in 1952. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 525 ft long, taller than 50% 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 Mariposa Lake Dam
The primary purpose of Mariposa Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jasper County Conservation Board (local government). It impounds the Tr-alloway Creek near Kellogg.
The dam stands 25 feet tall and stretches 525 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 188 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1952, 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. 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 05/28/2008. That was over 18 years ago.
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Location
| State | Iowa |
| County | Jasper |
| Nearest City | Kellogg |
| River/Stream | Tr-alloway Creek |
| Coordinates | 41.77720, -92.96160 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 525 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 188 acre-ft |
| Max Storage | 188 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jasper County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/28/2008 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01348 |
| Federal ID | IA01348 |
| More Info | State Dam Safety Program |