Lake Mary
Coconino County, ArizonaView 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 · Mercury
- 37 ft max depth
- Public access
- Limited data
Lake Mary in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
- Max depth
- ~37 ft est.
- Public access
- Yes
Stays via Stay22
Stays near Lake Mary
Compare lakeside cabins, hotels, and vacation rentals near Lake Mary in Coconino County, Arizona — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lake Mary
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip? Cabins and lodging at Lake Mary → · more Arizona lake trips
Watch Lake Mary’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Lake Mary 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 Lake Mary, 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.
Lake Mary is a lake in Coconino County, Arizona with an estimated average depth of about 37 feet. 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 Lake Mary 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. Lake Mary is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Lake Mary
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 | ~37 ft est. |
| Average Depth | ~36 ft est. |
| 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 Lake Mary.
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
- Lake Mary - 1Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Lake Mary
- Lakeview2.0 km
- Pinegrove3.3 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 Lake Mary
EPA Impairment Status
Lake Mary 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 AZL15020015-0900_00 · Official waterbody report · Matched by proximity (1.88 km)
Nearby Lakes in Coconino County
Frequently asked questions about Lake Mary
Where is Lake Mary?
- Lake Mary 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 Lake Mary?
- Lake Mary in Coconino County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Lake Mary safe to swim in?
- The letter is not a swimming clearance. Lake Mary is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Lake Mary?
- No published bathymetric survey covers Lake Mary, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Lake Mary?
- Lake Mary has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Mary - 1. Public access is listed as yes.
Are there campgrounds on Lake Mary?
- Lake Mary has 2 public campgrounds from USGS The National Map within 5 km, including Lakeview, Pinegrove. 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 Lake Mary across LakeQuality
Planning a trip around Montezuma Castle?
Lake Mary is about 36 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 Arizona Lake Rankings
Other Lakes in Arizona
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles