Ashurst Lake
Coconino County, Arizona230 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.
- Public access
- Limited data
Ashurst Lake in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 230 acres.
- Area
- 230 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Ashurst Lake’s letter
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Why Ashurst 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 Ashurst 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.
Ashurst Lake is a 230-acre lake in Coconino County, Arizona. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2025-11-01. Grade methodology: LakeQuality methodology.
What Ashurst Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- 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 Ashurst 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 |
|---|---|
| Surface Area | 230 acres |
| Public Access | Yes |
No bathymetric survey has been published for Ashurst Lake, so its depth is not documented here.
Recreation & Access
- Ashurst Lake CampgroundPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Ashurst Lake
- Ashurst Lake0.3 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 Ashurst Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.091 m/yr | 4 |
| Phosphorus | ↑ Improving | -13.05 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +21.98 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Ashurst Lake is a man-made reservoir impounded by the Ashurst Lake (completed 1954), built primarily for fish and wildlife pond on the Ashurst Run; earth-type dam, 12 ft tall and 707 ft long.
- Surface area
- 230 ac
- Normal storage
- 3,924 ac-ft
- Max storage
- 4,164 ac-ft
- Drainage area
- 1.2 sq mi
- Hazard class
- Low
- Owner
- ARIZONA GAME & FISH DEPARTMENT
All listed purposes: Fish and Wildlife Pond;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ00047 · Operator website
Nearby Lakes in Coconino County
Frequently asked questions about Ashurst Lake
Where is Ashurst Lake?
- Ashurst Lake is a lake in Coconino 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 Ashurst Lake?
- Ashurst Lake in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 230 acres.
Is Ashurst Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Ashurst Lake?
- Ashurst Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Ashurst Lake Campground. Public access is listed as yes.
Are there campgrounds on Ashurst Lake?
- Ashurst Lake has 1 public campground from USGS The National Map within 5 km, including Ashurst Lake. 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 Ashurst Lake across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC3 samples · 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
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles