Mallory Tank dam
Mallory Tank
Mallory Tank, located in Apache County, Arizona, is a vital water resource managed by the Arizona Department of Water Resources. Built in 1918, this earth dam stands at a height of 12.5 feet and serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a storage capacity of 113 acre-feet and a surface area of 27.1 acres, Mallory Tank plays a crucial role in providing water for both agricultural and wildlife needs in the region.
Despite being rated as having low hazard potential, Mallory Tank is identified as having a high risk level due to its age and lack of recent condition assessments. The dam has not been inspected since October 2009, highlighting the need for regular monitoring and maintenance to ensure its structural integrity and safety. While the dam currently does not have spillway infrastructure, it remains under state regulation and oversight to mitigate any potential risks associated with its operation.
As an essential component of the water infrastructure in the area, Mallory Tank serves as a reminder of the importance of proactive management and maintenance of water resources in the face of changing climate conditions. Its role in providing water for firefighting, livestock, and wildlife highlights the interconnectedness of water resources and the need for sustainable practices to ensure their long-term viability in the region.
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 Mallory Tank -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Colorado R Abv Lyman Lake Nr St. Johns | 0 cfs | → |
| Little Colorado R Blw Salado Springs | · | → |
| Little Colorado River At Greer | 1 cfs | → |
| Filler Ditch At Greer | 1 cfs | → |
| Little Colorado River Ab Zion Res Nr St. Johns | · | → |
| Little Colorado R Blw Zion Res Nr St. Johns | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mallory Tank.
Boat launches
Campgrounds
- Lyman Lake State Park
- Lym-3
- South Fork Campground
- Benny Creek Campground
- Benny Creek
- Brown Creek Campground
Fishing spots
- Lyman Lake
- Concho Lake
- Bunch Reservoir
- River Reservoir South Fishing Site
- Nelson Reservoir
- Lee Valley Reservoir
Paddle runs
- South Fork Little Colorado River
- West Fork Little Colorado River
- State Highway 261 To 1/2 Mile Above Crosby Crossing
- Headwaters In Mount Baldy Wilderness To 0.1 Miles Above Upper Fish Barrier
- Headwaters In Mount Baldy Wilderness To Wilderness Boundary
- Forest Boundary To 0.15 Miles Below Forest Road 116
More reservoirs
Track Mallory Tank 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 Mallory Tank
Where does the data for Mallory Tank 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 Mallory Tank.