Grassy Creek Watershed Dam G- 76 dam
Grassy Creek Watershed Dam G- 76
Grassy Creek Watershed Dam G-76, located in Lewis County, Missouri, was completed in 1993 by the USDA NRCS for flood risk reduction along the Grassy Creek. This earth-type dam stands at a height of 26 feet, with a hydraulic height of 25 feet and a structural height of 32 feet, providing storage for 59 acre-feet of water. With a normal storage capacity of 16 acre-feet and a drainage area of 153.6 square miles, the dam plays a crucial role in mitigating flood risks in the area.
Despite its low hazard potential, this dam has a moderate risk assessment rating of 3, highlighting the importance of regular inspections and monitoring. The dam features an uncontrolled spillway with a width of 20 feet and has not been modified since its completion. Although it is not regulated or inspected by the state, the dam serves multiple purposes including fire protection, wildlife habitat enhancement, and flood risk reduction. With its location in a region prone to extreme weather events, the maintenance and upkeep of Grassy Creek Watershed Dam G-76 are essential for ensuring the safety and well-being of the surrounding communities and ecosystems.
Owned and operated by the local government, Grassy Creek Watershed Dam G-76 stands as a vital infrastructure for water resource management in the region. With its stone core and soil foundation, the dam spans 430 feet in length and covers a surface area of 4 acres. While its condition assessment is currently not rated, the dam's emergency action plan and risk management measures play a crucial role in maintaining its integrity and safeguarding against potential hazards. As a key component in the watershed's flood control system, the dam serves as a testament to the importance of sustainable water resource management in the face of changing climates and increasing water-related risks.
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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Grassy Creek Watershed Dam G- 76 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fabius River Near Taylor | 34 cfs | → |
| North River At Palmyra | 6 cfs | → |
| Wyaconda River Above Canton | 17 cfs | → |
| Bear Creek Near Marcelline | 15 cfs | → |
| Bear Creek At Hannibal | 1 cfs | → |
| Salt River Near Shelbina | 78 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grassy Creek Watershed Dam G- 76.
Boat launches
- Marion County
- 130th Street Lewis County
- Broadway Hannibal
- Ralls County
- Spalding Boat Ramp
- County Road 496 Ralls County
Track Grassy Creek Watershed Dam G- 76 in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Grassy Creek Watershed Dam G- 76
Where does the data for Grassy Creek Watershed Dam G- 76 come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Grassy Creek Watershed Dam G- 76.