Fool Hollow Lake
Navajo County, Arizona152 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 15 ft max depth
- Public access
- Limited data
Fool Hollow Lake in Navajo County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 152 acres.
- Max depth
- ~15 ft est.
- Area
- 152 acres
- Trend
- ↓ Declining
- Public access
- Yes
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Stays near Fool Hollow Lake
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Watch Fool Hollow Lake’s letter
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Why Fool Hollow Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Fool Hollow Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Fool Hollow Lake is a 152-acre lake in Navajo County, Arizona with an estimated average depth of about 15 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2025-11-05. Grade methodology: LakeQuality methodology.
What Fool Hollow Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Fool Hollow Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~15 ft est. |
| Average Depth | ~13 ft est. |
| Surface Area | 152 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arizona has not published bathymetry for Fool Hollow Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
Public campgrounds near Fool Hollow Lake
- Fool Hollow Lake Recreation Area0.5 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Fool Hollow Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.58 m/yr | 2 |
| Phosphorus | ↓ Declining | +10 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Fool Hollow Lake is a man-made reservoir impounded by the Fool Hollow (completed 1956), built primarily for recreation on the Show Low Creek; rockfill-type dam, 78 ft tall and 500 ft long.
- Surface area
- 152 ac
- Normal storage
- 3,217 ac-ft
- Max storage
- 5,617 ac-ft
- Drainage area
- 102 sq mi
- Hazard class
- High
- Owner
- ARIZONA GAME & FISH DEPARTMENT
Source: USACE National Inventory of Dams, NID ID AZ00051 · Operator website
Nearby Lakes in Navajo County
Frequently asked questions about Fool Hollow Lake
Where is Fool Hollow Lake?
- Fool Hollow Lake is a lake in Navajo County, Arizona. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Fool Hollow Lake?
- Fool Hollow Lake in Navajo County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 152 acres.
Is Fool Hollow Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Fool Hollow Lake?
- No published bathymetric survey covers Fool Hollow Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 15 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 152 acres.
Are there campgrounds on Fool Hollow Lake?
- Fool Hollow Lake has 1 public campground from USGS The National Map within 5 km, including Fool Hollow Lake Recreation Area. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Fool Hollow Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC8 samples · 2022–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 300.0 ~ EPA; Determination of Inorganic Anions by Ion Chromatography
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Public campgrounds from USGS The National Map Structures, within about 3 miles