Lake Mary
Salt Lake County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Lake Mary. Here is what has been measured.
- Oligotrophic
- Limited data
Lake Mary in Salt Lake County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 26.9 ft visibility. Phosphorus: 3.1 µg/L. Chlorophyll-a (algae): 0.7 µg/L.
Lake Mary is a cold, clear oligotrophic lake in Salt Lake County, Utah. Overall water quality is declining over recent sampling years. Compared to the 2 other monitored lakes in Salt Lake County, Lake Mary ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2024-08-07. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Lake Mary on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Lake Mary is good for
From access and monitoring records, not editorial picks.
- Clear water26.9 ft of visibility
- Camping1 public campground nearby
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Mary is safe to swim in today is a call for the Utah Division of Water Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Mary
These are the measurements Utah DWQ publishes for Lake Mary, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 26.9 ft down. Phosphorus 3.1 µg/L. Chlorophyll-a 0.7 µg/L. TSI 26.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 26.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 3.1µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 0.7µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 26 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Lake Mary
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
Public campgrounds near Lake Mary
- Albion Basin2.2 kmReserve
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
Stays via Stay22
Stays near Lake Mary
Compare lakeside cabins, hotels, and vacation rentals near Lake Mary in Salt Lake County, Utah — 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
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Follow Lake Mary’s readings
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Fishing Lake Mary
Water quality readings over time
2 seasons of samples on record (2012–2024). Calling a direction takes at least 4 years of the same measurement.
Chlorophyll-a
Worsening+0.03 µg/L/yr2 years
Reservoir Info (USACE NID)
Lake Mary is a man-made reservoir impounded by the Lake Mary-Phoebe (completed 1915), built primarily for water supply on the Trib. To Big Cottonwood Cr.; gravity-type dam, 72 ft tall and 330 ft long.
- Normal storage
- 742 ac-ft
- Drainage area
- 1 sq mi
- Hazard class
- High
- Owner
- SALT LAKE CITY CORPORATION
Source: USACE National Inventory of Dams, NID ID UT00172 · Operator website · Matched by proximity (0.5 km)
Nearby Lakes in Salt Lake County
Frequently asked questions about Lake Mary
Where is Lake Mary?
- Lake Mary is a lake in Salt Lake County, Utah. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Lake Mary?
- Lake Mary in Salt Lake County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 26.9 ft visibility. Phosphorus: 3.1 µg/L. Chlorophyll-a (algae): 0.7 µg/L.
Is Lake Mary safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there campgrounds on Lake Mary?
- Lake Mary has 1 public campground from USGS The National Map within 5 km, including Albion Basin. 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
3 thermal springs within 23.2 mi, nearest Midway Hot Springs
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its readings
Utah's cleanest lakes, ranked on agency measurements
More lakes in Utah
Other Lakes in Utah
Oligotrophic Lakes in Utah
Where this data comes from
5 measurements from 1 monitoring station, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX5 samples · 2012–2024
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.
Other records on this page
Public campgrounds from USGS The National Map Structures, within about 3 miles