Lake Winnebago Dam Reservoir Report

Last Updated: December 7, 2025

Lake Winnebago Dam, located in Cass County, Missouri, is a privately owned earth dam completed in 1965 with a primary purpose of recreation.


°F

°F

mph

Wind

%

Humidity

Summary

Standing at a height of 64 feet and stretching 1200 feet in length, this dam holds a normal storage capacity of 4650 acre-feet, with a maximum storage of 7150 acre-feet. The dam overlooks the scenic Middle Big Creek, providing a serene backdrop for outdoor enthusiasts and water recreation activities.

Managed by the DAM AND RESERVOIR SAFETY PROG in Missouri, Lake Winnebago Dam has a high hazard potential but is currently assessed to be in satisfactory condition. The dam's spillway width of 330 feet allows for uncontrolled discharge during times of high water flow, with a maximum discharge capacity of 29150 cubic feet per second. Despite the moderate risk profile, regular inspections occur every two years to ensure the structural integrity and safety of the dam. Lake Winnebago Dam serves as a vital resource for both water supply and flood control in the region, highlighting the importance of proper maintenance and regulation for sustainable water resource management.

Year Completed

1965

Dam Length

1200

Dam Height

64

River Or Stream

MIDDLE BIG CREEK

Primary Dam Type

Earth

Surface Area

390

Drainage Area

12800

Nid Storage

7150

Structural Height

64

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

64
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.