Willow Creek Reservoir
Yavapai County, Arizona460 acresView mapDirections
No nutrient or algae sampling on record from ADEQ for this lake.
- Limited data
Willow Creek Reservoir in Yavapai County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 460 acres.
Willow Creek Reservoir is a 460-acre lake in Yavapai County, Arizona. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2022-04-12. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Willow Creek Reservoir is safe to swim in today is a call for the Arizona Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Willow Creek Reservoir
These are the measurements ADEQ publishes for Willow Creek Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Willow Creek Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
460 acres
No bathymetric survey has been published for Willow Creek Reservoir, so its depth is not documented here.
Stays via Stay22
Stays near Willow Creek Reservoir
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Fishing Willow Creek Reservoir
Water Quality Trend: Improving
Based on 7 years of monitoring (2012–2025).
Water clarity
Worsening3 years
Phosphorus
Improving-13.75 µg/L/yr7 years
Chlorophyll-a
Improving-8.26 µg/L/yr2 years
Reservoir Info (USACE NID)
Willow Creek Reservoir is a man-made reservoir impounded by the Willow Creek (completed 1936), built primarily for irrigation on the Willow Creek; arch-type dam, 99 ft tall and 297 ft long.
- Surface area
- 460 ac
- Normal storage
- 5,980 ac-ft
- Max storage
- 7,800 ac-ft
- Drainage area
- 25 sq mi
- Hazard class
- High
- Owner
- CITY OF PRESCOTT
All listed purposes: Irrigation;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID AZ00019 · Operator website
Nearby Lakes in Yavapai County
Frequently asked questions about Willow Creek Reservoir
Where is Willow Creek Reservoir?
- Willow Creek Reservoir is a lake in Yavapai County, Arizona. Its water-quality measurements are published by ADEQ and shown on this page as reported.
What is the water quality of Willow Creek Reservoir?
- Willow Creek Reservoir in Yavapai County, Arizona has water-quality measurements published by ADEQ, shown here as reported. Surface area: 460 acres.
Is Willow Creek Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Willow Creek Reservoir across LakeQuality
Planning a trip around Montezuma Castle?
Willow Creek Reservoir is about 35 miles from Montezuma Castle National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Montezuma Castle →More lakes in Arizona
Other Lakes in Arizona
Where this data comes from
6 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC6 samples · 2021–2022
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.