Cottonwood-green Valley Subws 50+40 #2
Cottonwood-green Valley Subws 50+40 #2 is an earth dam located in Monona County, Iowa, built in 1966. It carries a Low hazard potential classification.
About Cottonwood-green Valley Subws 50+40 #2
The primary purpose of Cottonwood-green Valley Subws 50+40 #2 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 Monona County Swcd (local government). It impounds the Tr-cottonwood Creek near Castana.
The dam stands 38 feet tall and stretches 928 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 92 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, 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.
At 38 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Iowa |
| County | Monona |
| Nearest City | Castana |
| River/Stream | Tr-cottonwood Creek |
| Coordinates | 42.06370, -95.87190 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 928 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 92 acre-ft |
| Max Storage | 92 acre-ft |
| Normal Storage | 45 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Monona County SWCD |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00745 |
| Federal ID | IA00745 |
| More Info | State Dam Safety Program |