Harvey Gap Reservoir
Garfield County, Colorado320 acresView mapDirections
No nutrient or algae sampling on record from Colorado WQCD for this lake.
- Impaired · Metals (other than mercury)
- 24 ft max depth
- Public access
- Limited data
Ask about Harvey Gap Reservoir
Answers come straight from the public measurements and survey records on this page.
Harvey Gap Reservoir in Garfield County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Surface area: 320 acres.
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Harvey Gap Reservoir is a 320-acre lake in Garfield County, Colorado with an estimated average depth of about 24 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2021-05-20. Grade methodology: LakeQuality methodology.
What Harvey Gap Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Harvey Gap Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), temperature. Check local advisories before you swim.
Whether Harvey Gap Reservoir is safe to swim in today is a call for the Water Quality Control Division of the Colorado Department of Public Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Harvey Gap Reservoir
These are the measurements Colorado WQCD publishes for Harvey Gap Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~24 ft est. |
| Average Depth | ~16 ft est. |
| Surface Area | 320 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Colorado has not published bathymetry for Harvey Gap 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
- Harvey Gap State ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Harvey Gap Reservoir
Reservoir Info (USACE NID)
Harvey Gap Reservoir is a man-made reservoir impounded by the Grass Valley (completed 1892), built primarily for irrigation on the Harvey Gap; earth-type dam, 61 ft tall and 800 ft long.
- Surface area
- 320 ac
- Normal storage
- 5,060 ac-ft
- Max storage
- 6,111 ac-ft
- Drainage area
- 2 sq mi
- Hazard class
- High
- Owner
- SILT WATER CONSERVANCY DISTRICT
Source: USACE National Inventory of Dams, NID ID CO00693 · Operator website
EPA Impairment Status
Harvey Gap Reservoir 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 COLCLC20_C · Official waterbody report
Nearby Lakes in Garfield County
Frequently asked questions about Harvey Gap Reservoir
Where is Harvey Gap Reservoir?
- Harvey Gap Reservoir is a lake in Garfield County, Colorado. Its water-quality measurements are published by Colorado WQCD and shown on this page as reported.
What is the water quality of Harvey Gap Reservoir?
- Harvey Gap Reservoir in Garfield County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Surface area: 320 acres.
Is Harvey Gap Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Harvey Gap Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), temperature. Check local advisories before you swim.
How deep is Harvey Gap Reservoir?
- No published bathymetric survey covers Harvey Gap Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 24 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 320 acres.
Are there boat ramps on Harvey Gap Reservoir?
- Harvey Gap Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Harvey Gap State Park. Public access is listed as yes.
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Where this data comes from
2 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX2 samples · 2021
Analytical methods
- Phosphorus by Colorimetry
- Nitrogen in Water by Pyrolysis Detection
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
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