E.E. Pettegrew Dam dam
E.E. Pettegrew Dam
E.E. Pettegrew Dam, located in South Dakota on the TRIBUTARY HORSEHEAD river, is a privately-owned structure completed in 1960 by the Natural Resources Conservation Service. This 14-foot high Earth dam serves multiple purposes, including flood control and water storage, with a maximum capacity of 54 acre-feet and a normal storage of 40 acre-feet. Despite its low hazard potential, the dam's condition has not been rated, highlighting the need for regular inspections and maintenance to ensure its continued safety and effectiveness.
Managed by the DENR and regulated by the state of South Dakota, E.E. Pettegrew Dam is subject to state permitting, inspection, and enforcement. The dam's location in Fall River County underscores its importance in water resource management for the region. With a maximum discharge capacity of 780 cubic feet per second, the dam plays a crucial role in mitigating potential flooding and protecting downstream communities and ecosystems. As climate change impacts water resources, the sustainable operation and maintenance of E.E. Pettegrew Dam are essential for adapting to evolving hydrological conditions.
While E.E. Pettegrew Dam currently has not been assessed for its emergency action plan or risk management measures, its strategic location and design make it a vital asset for water resource management in South Dakota. As water resource and climate enthusiasts, it is crucial to monitor the condition and functionality of dams like E.E. Pettegrew to ensure their resilience in the face of changing environmental conditions and increasing water demands. The presence of structures like E.E. Pettegrew Dam highlights the interconnectedness of water resources, climate change, and infrastructure management in safeguarding communities and ecosystems.
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 E.E. Pettegrew Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Horsehead Cr At Oelrichs Sd | · | → |
| Hat Cr Near Edgemont Sd | 0 cfs | → |
| Cheyenne R Below Angostura Dam Sd | 1 cfs | → |
| White R Nr Ne-Sd State Line | 3 cfs | → |
| Fall R At Hot Springs Sd | 34 cfs | → |
| Beaver Cr Near Buffalo Gap Sd | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near E.E. Pettegrew Dam.
Boat launches
- County Highway 6d Fall River County
- Fall River County
- Sheps Canyon Road Fall River County
- Whitney Lake
- South Boat Ramp Road Fall River County
Campgrounds
- Toadstool
- Toadstool Geological Park And Campground
- Angostura State Rec Area
- Crawford City Park
- Soldier Creek
- Fort Robinson State Park
Paddle runs
Track E.E. Pettegrew 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 E.E. Pettegrew Dam
Where does the data for E.E. Pettegrew 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 E.E. Pettegrew Dam.