Robertson No.1 dam
Robertson No.1
Located in Gregory, South Dakota, Robertson No.1 is a privately owned dam on Bull Creek, completed in 1975 with a height of 30 feet and a length of 1500 feet. The dam has a maximum storage capacity of 1998 acre-feet and a normal storage level of 1152 acre-feet. With a significant hazard potential, the dam is regulated by the South Dakota Department of Agriculture and Natural Resources, ensuring regular inspections, permitting, and enforcement to maintain its safety and compliance.
The dam's primary purpose and associated structures are not specified, but it serves as a crucial water resource in the region, contributing to flood control, irrigation, and water supply management. Despite its age, the dam's condition assessment is not rated, highlighting the need for further evaluation and potential upgrades to ensure long-term functionality and safety. Robertson No.1 plays a vital role in water management within the St. Paul District, supporting agriculture and local communities while facing the challenges of climate change and evolving water resource needs.
As a key infrastructure in the area, Robertson No.1 is overseen by private owners and state regulators, with a history of inspections dating back to 1981. With its significant storage capacity and critical location, the dam's risk potential and management measures warrant ongoing attention and monitoring. As water resource and climate enthusiasts, understanding the complexities and importance of structures like Robertson No.1 is crucial in safeguarding our natural ecosystems and ensuring sustainable water management practices for the future.
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 Robertson No.1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Platte Creek Near Platte | 1 cfs | → |
| Keya Paha R At Wewela Sd | 64 cfs | → |
| White R Near Oacoma Sd | 97 cfs | → |
| Keya Paha R Near Keyapaha Sd | 24 cfs | → |
| Niobrara River At Mariaville | 998 cfs | → |
| Long Pine Creek Near Riverview | 197 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Robertson No.1.
Track Robertson No.1 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 Robertson No.1
Where does the data for Robertson No.1 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 Robertson No.1.