Little Yellow 18 is a gravity dam located in Juneau County, Wisconsin, built in 1936. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 4,670 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Little Yellow 18
The primary purpose of Little Yellow 18 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by U.s. Department of the Interior (federal). It impounds the East Branch Little Yellow near Necedah.
The dam stands 8 feet tall and stretches 4,670 feet across, creates a reservoir covering 180 acres, has a maximum storage capacity of 840 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1936, the structure is well-established, with more than 75 years of service.
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 | Wisconsin |
| County | Juneau |
| Nearest City | Necedah |
| River/Stream | East Branch Little Yellow |
| Coordinates | 44.19179, -90.18527 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 4,670 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 840 acre-ft |
| Max Storage | 840 acre-ft |
| Normal Storage | 480 acre-ft |
| Surface Area | 180 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 400 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | U.s. Department of the Interior |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | WI00576 |
| Federal ID | WI00576 |
| More Info | State Dam Safety Program |