Antelope Lake
Graham County, Kansas83 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.
- Impaired · Nutrients (phosphorus, nitrogen)
- 13 ft max depth
- Limited data
Antelope Lake in Graham County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.9 ft visibility. Phosphorus: 215 µg/L. Chlorophyll-a (algae): 62 µg/L. Surface area: 83.1 acres.
- Clarity
- 0.9 ft
- Max depth
- ~13 ft est.
- Area
- 83 acres
- Phosphorus
- 215 µg/L
- Chlorophyll-a
- 62 µg/L
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Watch Antelope Lake’s letter
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Why Antelope Lake 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 Antelope Lake, 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 KDHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Antelope Lake is a 83-acre lake in Graham County, Kansas with an estimated average depth of about 13 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2016-08-16. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Antelope Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Antelope Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 0.9 ft of visibility. Phosphorus 215 µg/L. Chlorophyll-a 62 µg/L. TSI 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 ft | Not graded |
| Phosphorus | 215 µg/L | Not graded |
| Chlorophyll-a (Algae) | 62 µg/L | Not graded |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~13 ft est. |
| Average Depth | ~11 ft est. |
| Surface Area | 83 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Antelope 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.
Fishing Antelope Lake
Reservoir Info (USACE NID)
Antelope Lake is a man-made reservoir impounded by the Antelope Lake (completed 1996), built primarily for recreation on the Antelope Creek, 38 ft tall and 700 ft long.
- Surface area
- 83.1 ac
- Normal storage
- 773 ac-ft
- Max storage
- 1,838 ac-ft
- Drainage area
- 25 sq mi
- Hazard class
- Low
- Owner
- GRAHAM COUNTY
Source: USACE National Inventory of Dams, NID ID KS02544 · Operator website
EPA Impairment Status
Antelope 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 KS-LM069501 · Official waterbody report
Graded lakes near Antelope Lake
Antelope Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Graham County
Frequently asked questions about Antelope Lake
Where is Antelope Lake?
- Antelope Lake is a lake in Graham County, Kansas. 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 Antelope Lake?
- Antelope Lake in Graham County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.9 ft visibility. Phosphorus: 215 µg/L. Chlorophyll-a (algae): 62 µg/L. Surface area: 83.1 acres.
Is Antelope Lake safe to swim in?
- The letter is not a swimming clearance. Antelope Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Antelope Lake?
- No published bathymetric survey covers Antelope Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 13 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 83.1 acres.
Explore Antelope Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2016
Analytical methods
- Depth, Secchi disk depth
- 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)