Lake Ponderosa Dam dam
Lake Ponderosa Dam
Lake Ponderosa Dam, located in Poweshiek County, Iowa, is a vital water resource managed by the local government. Built in 1969 by THOMPSON WILLIS & CO., this Earth dam stands at a towering height of 50 feet and spans a length of 1090 feet, creating a reservoir with a normal storage capacity of 2500 acre-feet. The dam serves multiple purposes including recreation, with a surface area of 290 acres and a drainage area of 6.56 square miles, making it a popular spot for outdoor enthusiasts and water recreation activities.
Despite its high hazard potential, Lake Ponderosa Dam has been assessed to be in satisfactory condition, ensuring the safety of nearby residents and the surrounding ecosystem. The dam is regulated by the Iowa Department of Natural Resources, with regular inspections conducted to maintain its structural integrity. The presence of an uncontrolled spillway with a width of 4 feet further enhances the dam's ability to manage water flow during times of high discharge, reducing the risk of flooding downstream. With its strategic location on TR-MOON CREEK and the support from local government ownership, Lake Ponderosa Dam stands as a testament to effective water resource management and climate resilience in Iowa.
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 Lake Ponderosa Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Skunk River Near Oskaloosa | 1,230 cfs | → |
| Walnut Creek Near Hartwick | 33 cfs | → |
| Richland Creek Near Haven | 34 cfs | → |
| Big Bear Creek At Ladora | 122 cfs | → |
| Iowa River Near Belle Plaine | 2,050 cfs | → |
| Des Moines River Near Tracy | 6,910 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Ponderosa Dam.
Boat launches
- Jade Street Jasper County
- Rock Creek East Street Jasper County
- Mahaska County
- 216th Street Iowa County
- 360th Street Tama County
- State Highway 21 Iowa County
Track Lake Ponderosa 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 Lake Ponderosa Dam
Where does the data for Lake Ponderosa 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 High 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 Lake Ponderosa Dam.