Summary
Johns, Apache County, Arizona, is a private and state-owned water resource managed by the Arizona Department of Water Resources. Built in 1929, this Earth dam stands at a height of 9 feet and has a storage capacity of 375 acre-feet, primarily serving as a Fish and Wildlife Pond. The reservoir spans 15 acres with a drainage area of 3.5 square miles, drawing water from Carnero Creek.
Despite its age, Tyler Reservoir has a low hazard potential and a moderate risk assessment level of 3. It features an uncontrolled spillway with a width of 4 feet and has not been modified in recent years. The dam is inspected every 5 years, with the last assessment conducted in August 2020, although its condition is currently labeled as "Not Rated." While the reservoir is not under the jurisdiction of federal agencies, it plays a crucial role in fire protection, stock watering, and irrigation in the surrounding area.
Water resource and climate enthusiasts will find Tyler Reservoir a fascinating example of early 20th-century engineering for managing water resources in a semi-arid region like Arizona. Its combination of ecological significance as a Fish and Wildlife Pond, practical functions in agriculture and fire prevention, and historical importance as a local water management infrastructure make it a valuable asset in the state's water supply network. The reservoir's unassuming presence belies its essential role in sustaining local ecosystems and supporting human activities in the region.
Year Completed |
1929 |
Dam Length |
142 |
Dam Height |
9 |
River Or Stream |
CARNERO CREEK |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
9 |
Drainage Area |
3.5 |
Nid Storage |
375 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Benny Creek Campground
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Benny Creek
|
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Rolfe C. Hoyer Campground
|
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Rolfe C. Hoyer
|
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South Fork Campground
|
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Sunrise Lake
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Tyler Reservoir
West Fork Little Colorado River
South Fork Little Colorado River