Lake Henry
Crowley County, Colorado1,194 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 25 ft max depth
- Public access
- Limited data
Lake Henry in Crowley County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.3 ft visibility. Phosphorus: 68 µg/L. Chlorophyll-a (algae): 16.3 µg/L. Surface area: 1194 acres.
- Clarity
- 1.3 ft
- Max depth
- ~25 ft est.
- Area
- 1,194 acres
- Public access
- Yes
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Watch Lake Henry’s letter
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Why Lake Henry has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Henry, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by CDPHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Henry is a 1,194-acre lake in Crowley County, Colorado with an estimated average depth of about 25 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 2023-08-08. Grade methodology: LakeQuality methodology.
What Lake Henry is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water1,194 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Lake Henry is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
Water quality measurements for Lake Henry
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.3 ft of visibility. Phosphorus 68 µg/L. Chlorophyll-a 16.3 µg/L. TSI 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | Not graded |
| Phosphorus | 68 µg/L | Not graded |
| Chlorophyll-a (Algae) | 16.3 µg/L | Not graded |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~25 ft est. |
| Average Depth | ~14 ft est. |
| Surface Area | 1,194 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 Lake Henry.
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
- Lake Henry State Wildlife AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Henry
Reservoir Info (USACE NID)
Lake Henry is a man-made reservoir impounded by the Lake Henry (completed 1914), built primarily for irrigation on the Horse Creek-Os; earth-type dam, 24 ft tall and 12,920 ft long.
- Surface area
- 1,194 ac
- Normal storage
- 9,500 ac-ft
- Max storage
- 14,914 ac-ft
- Drainage area
- 7 sq mi
- Hazard class
- High
- Owner
- COLORADO CANAL COMPANY (MATT ROULEAU)
All listed purposes: Irrigation;Fish and Wildlife Pond;Recreation.
Source: USACE National Inventory of Dams, NID ID CO01116 · Operator website
EPA Impairment Status
Lake Henry is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit COARLA12_B · Official waterbody report
Graded lakes near Lake Henry
Lake Henry has no grade, but these lakes within a short drive do.
Nearby Lakes in Crowley County
Frequently asked questions about Lake Henry
Where is Lake Henry?
- Lake Henry is a lake in Crowley County, Colorado. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lake Henry?
- Lake Henry in Crowley County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.3 ft visibility. Phosphorus: 68 µg/L. Chlorophyll-a (algae): 16.3 µg/L. Surface area: 1194 acres.
Is Lake Henry safe to swim in?
- The letter is not a swimming clearance. Lake Henry is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
How deep is Lake Henry?
- No published bathymetric survey covers Lake Henry, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 25 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 1194 acres.
Are there boat ramps on Lake Henry?
- Lake Henry has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Henry State Wildlife Area. Public access is listed as yes.
Explore Lake Henry across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX4 samples · 2023
Analytical methods
- Secchi disk depth measurement
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Nitrogen in Water by Pyrolysis Detection
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)
Named boat-access points from the USGS National Boat Ramps inventory