Rob Roy Reservoir
Albany County, Wyoming801 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- #2 of 5 in the county
- Public access
- Limited data
Rob Roy Reservoir in Albany County, Wyoming has a water quality grade of B (Good). Water clarity: 11.2 ft visibility. Phosphorus: 10 µg/L. Surface area: 801 acres.
- Clarity
- 11.2 ft
- Area
- 801 acres
- Type
- Oligotrophic
- Phosphorus
- 10 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Rob Roy Reservoir’s letter
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Rob Roy Reservoir is a 801-acre cold, clear oligotrophic lake in Albany County, Wyoming. Water quality is graded B based on 1 sampling years through 2018. 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 Albany County, Rob Roy Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2018-09-05. Grade methodology: LakeQuality methodology.
What Rob Roy Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water11.2 ft of visibility
- Boat launch1 documented ramp
- 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. Check local advisories before you swim.
Water Quality Grade: B (Good)
Good clarity, visible to about 11.2 ft. Phosphorus 10 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.2 ft | Not graded |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 801 acres |
| Public Access | Yes |
No bathymetric survey has been published for Rob Roy Reservoir, so its depth is not documented here.
Recreation & Access
- Rob Roy ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Rob Roy Reservoir
- Rob Roy0.9 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 Rob Roy Reservoir
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.122 m/yr | 2 |
| Phosphorus | ↑ Improving | -3.33 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Rob Roy Reservoir is a man-made reservoir impounded by the Rob Roy (completed 1986), built primarily for water supply on the Douglas Creek; earth-type dam, 150 ft tall and 1,095 ft long.
- Surface area
- 801 ac
- Normal storage
- 35,434 ac-ft
- Max storage
- 42,264 ac-ft
- Drainage area
- 20.8 sq mi
- Hazard class
- High
- Owner
- CHEYENNE BOARD OF PUBLIC UTILITIES
All listed purposes: Water Supply;Irrigation.
Source: USACE National Inventory of Dams, NID ID WY00084 · Operator website
County Ranking
Ranked #2 of 5 lakes in Albany County
Nearby Lakes in Albany County
Frequently asked questions about Rob Roy Reservoir
Where is Rob Roy Reservoir?
- Rob Roy Reservoir is a lake in Albany County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rob Roy Reservoir?
- Rob Roy Reservoir in Albany County, Wyoming has a water quality grade of B (Good). Water clarity: 11.2 ft visibility. Phosphorus: 10 µg/L. Surface area: 801 acres.
Is Rob Roy Reservoir safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Rob Roy Reservoir?
- Rob Roy Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Rob Roy Reservoir. Public access is listed as yes.
Are there campgrounds on Rob Roy Reservoir?
- Rob Roy Reservoir has 1 public campground from USGS The National Map within 5 km, including Rob Roy. 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 Rob Roy Reservoir across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Wyoming's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Other Grade B Lakes in Wyoming
Oligotrophic Lakes in Wyoming
Where this data comes from
12 measurements from 2 monitoring stations, 2018. 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_WATERSHED12 samples · 2018
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
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles