Mclellan dam
Mclellan
Mclellan, located in Coconino, Arizona, is a privately owned gravity dam on Johnson Canyon, built in 1907 for the primary purpose of serving as a Fish and Wildlife Pond. With a height of 21 feet and a length of 293 feet, this structure has a storage capacity of 110 acre-feet and a surface area of 19 acres. The dam is regulated by the Arizona Department of Water Resources, with state permitting, inspection, and enforcement in place to ensure its safety and functionality.
Despite being categorized as having a low hazard potential, Mclellan is considered to have a moderate risk level (3) based on a risk assessment. The dam's condition assessment is currently marked as "Not Rated", with the last inspection conducted in September 2019. The spillway, which is uncontrolled, has a width of 120 feet. While Mclellan does not have associated locks or outlet gates, it remains an important structure for water resource management in the area, supporting wildlife habitats and contributing to the local ecosystem in Masonry #2 Dam.
Overall, Mclellan plays a vital role in maintaining the ecological balance of Johnson Canyon and the surrounding areas in Arizona. Its historical significance, combined with its functionality as a Fish and Wildlife Pond, highlights the importance of proper regulation and maintenance to ensure the safety and sustainability of this gravity dam for future generations of water resource and climate enthusiasts to appreciate and enjoy.
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 Mclellan -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Verde River Near Paulden | 16 cfs | → |
| Verde River Near Clarkdale | 58 cfs | → |
| Del Rio Springs Near Chino Valley | 0 cfs | → |
| Williamson Valley Wash Near Paulden | · | → |
| Oak Creek Near Sedona | 27 cfs | → |
| Oak Creek Near Cornville | 23 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mclellan.
Campgrounds
- Kaibab Lake Campground
- Kaibab Lake
- Kaibab Lake Campground And Group Areas
- Dogtown Lake
- Dogtown Lake Campground
- White Horse Lake
Fishing spots
Paddle runs
- Parsons Spring To Confluence Of The Verde River
- Headwaters In Sec 14, T19n, R5e To Confluence With Oak Creek
- Sterling Springs Fish Hatchery To Private Land In Sec 5, T17n,R6e
- Indian Gardens
- Wet Beaver Creek Wilderness Boundary To Private Land In Sec 32, T15n, R6e
- White Bridge To Beasley Flat
More reservoirs
Track Mclellan 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 Mclellan
Where does the data for Mclellan 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 Mclellan.