Grassy Creek Watershed Dam G- 98 dam
Grassy Creek Watershed Dam G- 98
Grassy Creek Watershed Dam G-98, located in Lewis, Missouri, was completed in 1993 by the USDA NRCS and serves a primary purpose of flood risk reduction along the Grassy Creek. This earth dam stands at a height of 29 feet and has a hydraulic height of 28 feet, providing a maximum storage capacity of 143 acre-feet. With a normal storage capacity of 36 acre-feet and a drainage area of 145 square miles, this dam plays a crucial role in managing water flow and mitigating flood risks in the region.
Despite being classified as a low hazard potential structure, Grassy Creek Watershed Dam G-98 has a moderate risk assessment rating of 3. The dam features an uncontrolled spillway type with a width of 30 feet, designed to handle a maximum discharge of 223 cubic feet per second. Although the condition assessment is currently listed as "Not Rated," regular inspections are conducted to ensure the safety and functionality of the dam. While the dam does not have outlet gates or associated structures, it remains an essential part of the local government's flood risk reduction strategy in the area.
With its strategic location in the Grassy Creek watershed, Dam G-98 plays a vital role in protecting the surrounding area from potential flooding events. The dam's design, construction, and operation are overseen by the Natural Resources Conservation Service, contributing to the overall management of water resources in Missouri. As a key component in the region's flood risk reduction efforts, Grassy Creek Watershed Dam G-98 highlights the importance of proactive infrastructure to protect communities and wildlife habitats from the impacts of extreme weather events and changing climate patterns.
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- 98 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fabius River Near Taylor | 36 cfs | → |
| North River At Palmyra | 6 cfs | → |
| Wyaconda River Above Canton | 19 cfs | → |
| Bear Creek Near Marcelline | 17 cfs | → |
| Bear Creek At Hannibal | 1 cfs | → |
| Salt River Near Shelbina | 176 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grassy Creek Watershed Dam G- 98.
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- 98 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- 98
Where does the data for Grassy Creek Watershed Dam G- 98 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- 98.