Grassy Creek Watershed Dam G- 64 Reservoir Report
Last Updated: December 25, 2025
Grassy Creek Watershed Dam G-64, located in Lewis, Missouri, was completed in 1993 by the USDA NRCS and serves primarily for flood risk reduction along the Grassy Creek.
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Summary
This earth dam stands at a height of 33 feet, with a hydraulic height of 33 feet and a structural height of 37 feet. With a length of 730 feet and a maximum storage capacity of 87 acre-feet, the dam covers a surface area of 4 acres and drains a watershed area of 108.8 square miles.
Despite being labeled as low hazard potential and having a moderate risk assessment rating, Grassy Creek Watershed Dam G-64 has not been inspected since September 1999. The dam lacks an emergency action plan and does not meet certain guidelines, raising concerns about its preparedness for potential emergencies. The dam is not regulated by the state of Missouri and does not have any associated structures, outlet gates, or locks, highlighting the need for increased oversight and maintenance to ensure its continued effectiveness in flood risk reduction for the surrounding community.
Water resource and climate enthusiasts monitoring Grassy Creek Watershed Dam G-64 should be aware of its condition assessment as "Not Rated" and the absence of recent inspections or emergency preparedness measures. With a focus on flood risk reduction and a history of completion by the USDA NRCS, there is a need for increased attention to this dam to ensure its long-term viability and safety for the residents of Ewing and the surrounding area in Lewis, Missouri.
Year Completed |
1993 |
Dam Length |
730 |
Dam Height |
33 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
33 |
Drainage Area |
108.8 |
Nid Storage |
87 |
Structural Height |
37 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wyaconda River Above Canton
|
13cfs |
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
11cfs |
Bear Creek Near Marcelline
|
5cfs |
Salt River Near Shelbina
|
20cfs |
Fox River At Wayland
|
8cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Grassy Creek Watershed Dam G- 64