Anthon Subwatershed 1-2261 is an earth dam located in Woodbury County, Iowa, built in 1954. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 28 ft28 ft tall and 400 ft long, taller than 62% 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 Anthon Subwatershed 1-2261
Anthon Subwatershed 1-2261 is a dam in Woodbury, Iowa. The dam is owned by Woodbury County Swcd (local government). It impounds the Tr-little Sioux River near Anthon.
The dam stands 28 feet tall and stretches 400 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 25 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1954, 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 10/18/2022.
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Location
| State | Iowa |
| County | Woodbury |
| Nearest City | Anthon |
| River/Stream | Tr-little Sioux River |
| Coordinates | 42.38690, -95.88010 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 400 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 25 acre-ft |
| Max Storage | 25 acre-ft |
| Normal Storage | 6 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Woodbury County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/18/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01921 |
| Federal ID | IA01921 |
| More Info | State Dam Safety Program |