Dd No 21 dam
Dd No 21
Dd No 21, located in Pottawatomie County, Kansas, is a crucial flood risk reduction structure designed by F. V. Robbins and completed in 2009. This earth dam stands at a height of 42 feet and spans 680 feet in length, with a storage capacity of 691 acre-feet and a drainage area of 2.48 square miles. The dam is regulated by the Kansas Department of Agriculture and undergoes regular inspections to ensure its structural integrity and effectiveness in mitigating flood risks along Wilson Creek.
With a significant hazard potential and a moderate risk assessment rating, Dd No 21 plays a vital role in protecting the surrounding community from potential flooding events. The dam features an uncontrolled spillway with a width of 40 feet and has no outlet gates. Despite its condition being not rated, the dam is subject to a rigorous inspection schedule every 5 years to assess any maintenance or repair needs. The structure is owned and operated by the local government, highlighting the collaborative effort in safeguarding water resources and enhancing climate resilience in the region.
As a key component in the flood risk reduction infrastructure of Kansas, Dd No 21 serves as a critical defense against potential inundation and protects downstream areas from the impacts of high discharge events. With its strategic location and hydraulic height considerations, the dam effectively manages floodwaters from Wilson Creek, ensuring the safety and well-being of the local community. The structure's construction and design reflect a commitment to sustainable water resource management and climate adaptation, underscoring the importance of proactive measures in safeguarding against natural disasters.
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 Dd No 21 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Rock C Nr Louisville | 16 cfs | → |
| Vermillion C Nr Wamego | 22 cfs | → |
| Big Blue R Nr Manhattan | 557 cfs | → |
| Black Vermillion R Nr Frankfort | 71 cfs | → |
| Kansas R At Wamego | 1,240 cfs | → |
| Fancy C At Winkler | 8 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Dd No 21.
Boat launches
- Park Road Pottawatomie County
- Spillway Marina Road Pottawatomie County
- Stockdale Park Road 4800, Manhattan
- Mound Ridge Drive Riley County
- Riley County
- Baldwin Creek Road Riley County
Campgrounds
- Oregon Trail Rv Park
- Stockdale - Tuttle Creek Reservoir
- Tuttle Creek State Park
- Tuttle Creek Cove - Tuttle Creek Lake
- Blue Rapids/Riverside City Park
- Waterville City
Fishing spots
More reservoirs
Track Dd No 21 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 Dd No 21
Where does the data for Dd No 21 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 Significant 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 Dd No 21.