Sayersbrook Dam Reservoir Report

Last Updated: December 5, 2025

Sayersbrook Dam, also known as Sayersbrook Lake Dam, is a privately owned structure located in Washington, Missouri.


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Summary

Completed in 1971, this earth dam stands at a height of 67 feet and has a length of 920 feet, creating a reservoir with a storage capacity of 1080 acre-feet. The primary purpose of the dam is irrigation, but it also serves recreational activities in the area.

Managed by the DAM AND RESERVOIR SAFETY PROG in Missouri, Sayersbrook Dam is classified as having a high hazard potential, yet its condition assessment is marked as satisfactory. The dam has a spillway width of 33 feet and a maximum discharge capacity of 3920 cubic feet per second. While it has not been modified in recent years, the dam undergoes regular inspections to ensure its safety and compliance with state regulations.

Located on the Ashly Branch river, Sayersbrook Dam plays a crucial role in water resource management in the region. With its moderate risk assessment rating and a history of meeting safety guidelines, this dam stands as a vital infrastructure for irrigation and recreation while being subject to strict state oversight and inspection protocols.

Year Completed

1971

Dam Length

920

Dam Height

67

River Or Stream

ASHLY BRANCH

Surface Area

36

Drainage Area

820

Nid Storage

1080

Structural Height

67

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

67
       
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.