Luna Lake
Apache County, Arizona163 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.
- Impaired · Ammonia
- Public access
- Limited data
Luna Lake in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 163 acres.
- Area
- 163 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Luna Lake’s letter
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Why Luna 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 Luna 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.
Luna Lake is a 163-acre lake in Apache 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 2026-03-22. Grade methodology: LakeQuality methodology.
What Luna Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Camping2 public campgrounds nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Luna Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for ammonia, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Water quality measurements for Luna 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 | 163 acres |
| Public Access | Yes |
No bathymetric survey has been published for Luna Lake, so its depth is not documented here.
Recreation & Access
- Luna LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Luna Lake
- Luna Lake Group Cg0.5 km
- Luna Lake Cg0.5 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 Luna Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.065 m/yr | 4 |
| Phosphorus | ↓ Declining | +39.49 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -2.74 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Luna Lake is a man-made reservoir impounded by the Luna (completed 1911), built primarily for irrigation on the San Francisco River; earth-type dam, 27 ft tall and 292 ft long.
- Surface area
- 163 ac
- Normal storage
- 1,390 ac-ft
- Max storage
- 1,800 ac-ft
- Drainage area
- 36 sq mi
- Hazard class
- Significant
- Owner
- LUNA IRRIGATION CO.
All listed purposes: Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID AZ00030 · Operator website
EPA Impairment Status
Luna Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit AZL15040004-0840_00 · Official waterbody report
Nearby Lakes in Apache County
Frequently asked questions about Luna Lake
Where is Luna Lake?
- Luna Lake is a lake in Apache 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 Luna Lake?
- Luna Lake in Apache County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 163 acres.
Is Luna Lake safe to swim in?
- The letter is not a swimming clearance. Luna Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for ammonia, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Are there boat ramps on Luna Lake?
- Luna Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Luna Lake. Public access is listed as yes.
Are there campgrounds on Luna Lake?
- Luna Lake has 2 public campgrounds from USGS The National Map within 5 km, including Luna Lake Group Cg, Luna Lake Cg. 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 Luna Lake across LakeQuality
2 thermal springs within 16.4 mi, nearest Frieborn Canyon Spring
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Where this data comes from
3 measurements from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Great Lakes Environmental Center
GLEC3 samples · 2026
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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles