G. Holloway dam
G. Holloway
G. Holloway, also known as Lantry, is a privately owned earth dam located in Dewey County, South Dakota. This dam, completed in 1936, serves the primary purpose of water resource management along the TR-MOREAU river or stream. With a height of 23 feet and a length of 890 feet, G. Holloway has a storage capacity of 690 acre-feet and a maximum discharge rate of 600 cubic feet per second. Despite being classified as a low hazard potential structure, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place.
Situated within the St. Paul District of the US Army Corps of Engineers, G. Holloway plays a critical role in flood control and water supply for the region. While the dam's condition assessment is currently marked as "Not Rated," its emergency action plan status and risk management measures are not specified. The structure has not been modified in recent years, and details on associated structures, outlet gates, or inundation maps are not provided. Overall, G. Holloway stands as a testament to early 20th-century engineering and continues to support the water needs of Dewey County with its efficient design and operational capabilities.
For water resource and climate enthusiasts, G. Holloway represents a remarkable piece of infrastructure that intersects with environmental stewardship and public safety. As climate change impacts become more pronounced, the role of dams like G. Holloway in managing water resources and mitigating risks will be increasingly crucial. Understanding the regulatory framework, operational aspects, and potential future challenges faced by G. Holloway can provide valuable insights into sustainable water management practices in the face of a changing climate.
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 G. Holloway -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Moreau R Near Whitehorse Sd | 243 cfs | → |
| Moreau R Near Faith Sd | 78 cfs | → |
| Cheyenne R Near Plainview Sd | 1,810 cfs | → |
| Grand R At Little Eagle Sd | 72 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near G. Holloway.
Track G. Holloway 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 G. Holloway
Where does the data for G. Holloway 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 G. Holloway.