Grassy Creek Watershed Dam G- 47 Reservoir Report

Last Updated: December 5, 2025

Grassy Creek Watershed Dam G-47, located in Lewis, Missouri, was completed in 2005 by the USDA NRCS with a primary purpose of flood risk reduction.


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Summary

This earth dam stands at a height of 26 feet and has a structural height of 30 feet, with a length of 525 feet and a storage capacity of 177.1 acre-feet. The dam serves multiple purposes including fire protection, stock or small fish pond, fish and wildlife habitat, and flood risk reduction for the region.

With a low hazard potential and a moderate risk assessment rating, Grassy Creek Watershed Dam G-47 is considered to be in good condition, although it has not been formally rated. The dam features an uncontrolled spillway with a width of 40 feet and is inspected annually for maintenance and safety. The surrounding area has a drainage area of 198.4 acres and a normal storage capacity of 41.7 acre-feet, providing essential water resource management for the local community. As an important structure for flood risk reduction in the region, Grassy Creek Watershed Dam G-47 plays a crucial role in protecting the environment and enhancing water sustainability in the area.

Year Completed

2005

Dam Length

525

Dam Height

26

River Or Stream

GRASSY CREEK

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

26

Drainage Area

198.4

Nid Storage

177.1

Structural Height

30

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
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.