SNOFLO


ETHAN

RESERVOIR LEVELS
Soil Dam Twelve Mile Creek
May 12, 2025


57°F

Tonight

91°F

Tuesday

13mph

Windspeed

42%

Humidity

Ethan is a state-owned earth dam located in South Dakota along the Twelve Mile Creek, with a height of 15 feet and a length of 750 feet. Built in 1936 by the Works Progress Administration (WPA), this dam serves as a crucial water resource structure for the region, providing a maximum storage capacity of 402 acre-feet and a normal storage capacity of 210 acre-feet. The dam has a low hazard potential and is currently rated as not assessed for its condition.

Managed by the South Dakota Department of Agriculture and Natural Resources, Ethan is regulated, permitted, inspected, and enforced by the state. Its spillway is uncontrolled with a width of 30 feet, and it has a maximum discharge capacity of 1370 cubic feet per second. Despite its moderate risk assessment rating, the dam has not been assigned a Dam Safety Action Classification (DSAC) date, indicating a need for further risk management measures to be put in place. With its historical significance and vital role in water management, Ethan stands as a testament to the importance of maintaining and monitoring our water infrastructure.

Year_Completed 1936
Dam_Height 15
River_Or_Stream TWELVE MILE CREEK
Dam_Length 750
Primary_Dam_Type Earth
Hydraulic_Height 15
Nid_Storage 402
Outlet_Gates None
Hazard_Potential Low
Foundations Soil
Nid_Height 15
       

Weather Forecast

Created with Highcharts 8.0.0humidity0.04"0.04"0.1"0.1"1.92"1.92"8.19"8.19"0.32"0.32"0.28"0.28"Tue May 13Wed May 14Thu May 15Fri May 16Sat May 1764°128°192°100%0%50%150%