Koch Dam dam
Koch Dam
Koch Dam, located in Clarke County, Iowa, was completed in 1997 and serves multiple purposes including fire protection, stock watering, and as a small fish pond. The dam, primarily made of earth with a stone core and soil foundation, stands at a height of 28 feet and spans a length of 288 feet. The reservoir created by Koch Dam has a normal storage capacity of 12 acre-feet and covers a surface area of 2 acres, with a drainage area of 0.07 square miles.
Managed by a private owner, Koch Dam is classified as having a low hazard potential and a moderate risk assessment rating. Despite not being regulated or inspected by state agencies, the dam is designed and constructed by the USDA NRCS, and falls under the jurisdiction of the Kansas City District of the US Army Corps of Engineers. The dam's spillway is uncontrolled, and there are no outlet gates or associated locks. With its picturesque location along the TR- South River, Koch Dam provides a valuable water resource for the community of Indianola and surrounding areas while also contributing to local wildlife habitat and recreational opportunities.
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 Koch Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Raccoon River At Van Meter | 1,900 cfs | → |
| North River Near Norwalk | 244 cfs | → |
| Middle River Near Indianola | 271 cfs | → |
| South River Near Ackworth | 111 cfs | → |
| Raccoon River Near West Des Moines | 1,320 cfs | → |
| South Raccoon River At Redfield | 762 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Koch Dam.
Boat launches
- Us 34 Clarke County
- State Highway 25 Creston
- Pershing Street Warren County
- 118th Avenue Warren County
- 120th Street Madison County
- 360th Street Dallas County
Track Koch Dam 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 Koch Dam
Where does the data for Koch Dam 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 Koch Dam.