Round Mountain Detention Dam 2 dam
Round Mountain Detention Dam 2
Round Mountain Detention Dam 2, located in Lazy B Ranch Headquarters, Arizona, is a gravity dam designed by the Bureau of Land Management to mitigate flood risk along the Round Mountain Draw Wash. Completed in 1954, this federal-owned structure stands at a height of 30 feet and spans a length of 1200 feet, with a capacity to store 920 acre-feet of water. The dam has a low hazard potential and is deemed to be in fair condition, with a moderate risk assessment rating of 3.
Managed by the DOI BLM, Round Mountain Detention Dam 2 serves as a critical flood risk reduction measure in Greenlee County. The dam's uncontrolled spillway and stone buttress core contribute to its effectiveness in managing stormwater runoff from a drainage area of 32.35 square miles. With a normal storage capacity of 650 acre-feet and a maximum discharge rate of 5250 cubic feet per second, this dam plays a crucial role in safeguarding downstream communities and infrastructure from potential flooding events.
Despite not being regulated by the state, Round Mountain Detention Dam 2 undergoes inspections every five years to ensure its structural integrity and operational readiness. While the dam is classified as having a moderate risk level, its presence helps to mitigate flood-related hazards in the region. As climate change intensifies the frequency and severity of extreme weather events, the importance of well-maintained flood control structures like Round Mountain Detention Dam 2 becomes increasingly apparent in protecting water resources and communities 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 Round Mountain Detention Dam 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Gila River At Duncan | 12 cfs | → |
| Gila River Below Blue Creek | 17 cfs | → |
| Gila River Near Redrock | 28 cfs | → |
| Gila River Near Clifton | 15 cfs | → |
| Gila River At Head Of Safford Valley | 22 cfs | → |
| San Francisco River At Clifton | 10 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Round Mountain Detention Dam 2.
Campgrounds
Fishing spots
Track Round Mountain Detention Dam 2 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 Round Mountain Detention Dam 2
Where does the data for Round Mountain Detention Dam 2 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 Round Mountain Detention Dam 2.