Oro Ranch (Lake Mary) dam
Oro Ranch (Lake Mary)
Oro Ranch (Lake Mary) is a private dam located in Yavapai, Arizona, with a primary purpose of providing fire protection, stock, or a small fish pond. The dam, with an earth core design and buttress foundation, stands at a height of 30.5 feet and spans a length of 340 feet, creating a reservoir with a storage capacity of 2,284 acre-feet. Situated on the North Mountain Hope Wash, the dam serves as a critical water resource in the region, with low hazard potential and a moderate risk assessment rating.
Managed by the Arizona Department of Water Resources, Oro Ranch undergoes regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulations. Despite its condition not being rated, the dam's last inspection in 2007 deemed it to have low hazard potential. While the dam does not have an Emergency Action Plan (EAP) in place, it meets state jurisdiction and regulatory requirements, contributing to water resource management and climate resilience efforts in the area.
Overall, Oro Ranch (Lake Mary) plays a crucial role in providing water for fire protection and livestock while serving as a recreational spot for small fish. With its controlled spillway and moderate risk assessment, the dam stands as a key infrastructure managed by the state to ensure the safety and sustainability of water resources in the region. As water resource and climate enthusiasts, it is essential to monitor and support efforts to maintain and enhance the functionality of such critical structures for the benefit of the community and the environment.
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 Oro Ranch (Lake Mary) -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Williamson Valley Wash Near Paulden | · | → |
| Burro Creek At Old Us 93 Bridge Nr Bagdad | · | → |
| Del Rio Springs Near Chino Valley | 0 cfs | → |
| Truxton Wash Near Valentine | · | → |
| Big Sandy River Near Wikieup | 3 cfs | → |
| Verde River Near Paulden | 16 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Oro Ranch (Lake Mary).
🎣 Fishing spots
More fishing →Track Oro Ranch (Lake Mary) 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 Oro Ranch (Lake Mary)
Where does the data for Oro Ranch (Lake Mary) 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 Oro Ranch (Lake Mary).