Lyman Lake
Summit County, UtahView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- Impaired · Oxygen depletion (low DO)
- #4 of 18 in the county
- 27 ft max depth
- Limited data
Lyman Lake in Summit County, Utah has a water quality grade of B (Good). Water clarity: 19.7 ft visibility. Phosphorus: 10.3 µg/L. Chlorophyll-a (algae): 2.1 µg/L.
- Clarity
- 19.7 ft
- Max depth
- ~27 ft est.
- Type
- Oligotrophic
- Phosphorus
- 10.3 µg/L
- Chlorophyll-a
- 2.1 µg/L
- Trend
- ↓ Declining
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Watch Lyman Lake’s letter
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Lyman Lake is a cold, clear oligotrophic lake in Summit County, Utah with an estimated average depth of about 27 feet. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 17 other monitored lakes in Summit County, Lyman Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2023-09-25. Grade methodology: LakeQuality methodology.
What Lyman Lake is good for
From access and monitoring records, not editorial picks.
- Clear water19.7 ft of visibility
- Camping1 public campground nearby
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, not a swimming clearance. Lyman Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: B (Good)
Crystal clear, you can see 19.7 ft down. Phosphorus 10.3 µg/L. Chlorophyll-a 2.1 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 19.7 ft | Not graded |
| Phosphorus | 10.3 µg/L | Good |
| Chlorophyll-a (Algae) | 2.1 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~27 ft est. |
| Average Depth | ~17 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Utah has not published bathymetry for Lyman 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 Lyman Lake
- Little Lyman 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 Lyman Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.283 m/yr | 2 |
EPA Impairment Status
Lyman Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit UT-L-14040107-005_00 · Official waterbody report
County Ranking
Ranked #4 of 18 lakes in Summit County
Nearby Lakes in Summit County
Frequently asked questions about Lyman Lake
Where is Lyman Lake?
- Lyman Lake is a lake in Summit County, Utah. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lyman Lake?
- Lyman Lake in Summit County, Utah has a water quality grade of B (Good). Water clarity: 19.7 ft visibility. Phosphorus: 10.3 µg/L. Chlorophyll-a (algae): 2.1 µg/L.
Is Lyman Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Lyman Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
How deep is Lyman Lake?
- No published bathymetric survey covers Lyman Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 27 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 campgrounds on Lyman Lake?
- Lyman Lake has 1 public campground from USGS The National Map within 5 km, including Little Lyman 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 Lyman Lake across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Where this data comes from
18 measurements from 1 monitoring station, 2017–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX18 samples · 2017–2023
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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)
Public campgrounds from USGS The National Map Structures, within about 3 miles