Healy Reservoir
Johnson County, Wyoming246 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Mesotrophic
- #5 of 5 in the county
- 19 ft max depth
- Public access
- Limited data
Healy Reservoir in Johnson County, Wyoming has a water quality grade of B (Good). Water clarity: 15.3 ft visibility. Phosphorus: 20 µg/L. Surface area: 246 acres.
- Clarity
- 15.3 ft
- Max depth
- ~19 ft est.
- Area
- 246 acres
- Type
- Mesotrophic
- Phosphorus
- 20 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Healy Reservoir’s letter
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Healy Reservoir is a 246-acre mesotrophic lake in Johnson County, Wyoming with an estimated average depth of about 19 feet. Water quality is graded B based on 1 sampling years through 2019. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 4 other monitored lakes in Johnson County, Healy Reservoir ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2019-09-09. Grade methodology: LakeQuality methodology.
What Healy Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water15.3 ft of visibility
- Boat launch1 documented ramp
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. Check local advisories before you swim.
Water Quality Grade: B (Good)
Crystal clear, you can see 15.3 ft down. Phosphorus 20 µg/L. TSI 43. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.3 ft | Not graded |
| Phosphorus | 20 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~19 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 246 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Healy Reservoir.
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
- Healy ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Healy Reservoir
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -1.67 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Healy Reservoir is a man-made reservoir impounded by the Healy (completed 1975), built primarily for irrigation on the Clear Creek; earth-type dam, 76 ft tall and 8,900 ft long.
- Surface area
- 246 ac
- Normal storage
- 5,140 ac-ft
- Max storage
- 6,500 ac-ft
- Drainage area
- 1.1 sq mi
- Hazard class
- High
- Owner
- WYOMING WATER DEVELOPMENT COMMISSION
All listed purposes: Irrigation;Fire Protection, Stock, Or Small Fish Pond;Other;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID WY01495 · Operator website
County Ranking
Ranked #5 of 5 lakes in Johnson County
Nearby Lakes in Johnson County
Frequently asked questions about Healy Reservoir
Where is Healy Reservoir?
- Healy Reservoir is a lake in Johnson County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Healy Reservoir?
- Healy Reservoir in Johnson County, Wyoming has a water quality grade of B (Good). Water clarity: 15.3 ft visibility. Phosphorus: 20 µg/L. Surface area: 246 acres.
Is Healy Reservoir safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Healy Reservoir?
- No published bathymetric survey covers Healy Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 19 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 246 acres.
Are there boat ramps on Healy Reservoir?
- Healy Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Healy Reservoir. Public access is listed as yes.
Explore Healy Reservoir across LakeQuality
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Mesotrophic Lakes in Wyoming
Where this data comes from
7 measurements from 2 monitoring stations, 2016–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED7 samples · 2016–2019
Analytical methods
- Secchi
- Total Phosphorus After Block Digestion
Monitoring station identifiers (2)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory