Dunnagan dam
Dunnagan
Dunnagan is a privately owned irrigation dam located in Colorado, specifically in Archuleta County near Blanco, NM. Built in 1949 by the USDA NRCS, this earth dam stands at a height of 19 feet and has a length of 569 feet, with a storage capacity of 201 acre-feet. The primary purpose of Dunnagan is irrigation, serving the surrounding area with water from the Roush Draw river or stream.
Although Dunnagan has a low hazard potential and is currently in a not-rated condition, it is regulated by the Colorado Department of Water Resources. The dam has not been inspected since 1987, with an inspection frequency of every 6 years. Despite the moderate risk assessment rating, there are no specific risk management measures or emergency action plans in place for Dunnagan. The dam also features an uncontrolled spillway and has a maximum discharge of 378 cubic feet per second.
Enthusiasts of water resources and climate will find Dunnagan intriguing due to its historical significance in providing irrigation water in the region. With its location near Blanco, NM and the Roush Draw river, this dam plays a vital role in the agricultural landscape of Archuleta County. As efforts to manage and maintain water resources continue, Dunnagan stands as a reminder of the importance of infrastructure in sustaining agricultural practices in Colorado.
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 Dunnagan -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| San Juan River At Pagosa Springs | 491 cfs | → |
| East Fork San Juan River Nr Pagosa Springs | -888 cfs | → |
| Rio Blanco Bl Blanco Div Dam | 38 cfs | → |
| Piedra River Near Arboles | 272 cfs | → |
| Vallecito Creek Near Bayfield | 150 cfs | → |
| San Juan River Near Carracas | 603 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Dunnagan.
Boat launches
Campgrounds
Fishing spots
- Williams Creek Reservoir
- Echo Canyon Reservoir
- Teal Boat Ramp
- Alberta Park Reservoir
- Vallecito Reservoir
- Love Lake Picnic Site
Paddle runs
- Ef/Middle Fork At Weminuche Wilderness Boundary To Forest Development Road 631
- Fdr 631 To Indian Creek
- Middle Fork--Headwaters To Weminuche Wilderness Boundary
- East Fork--Unnamed Ponds Approx 1/4 Mile Below Continental Divide To Weminuche Wilderness Boundary
- Indian Creek To Co Hwy 160
- Lake Creek--Headwaters To Confluence With Los Pinos
More reservoirs
Track Dunnagan 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 Dunnagan
Where does the data for Dunnagan 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 Dunnagan.