Crystal Lake
Anderson County, KansasView 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)
- Limited data
Crystal Lake in Anderson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.4 ft visibility. Phosphorus: 88.5 µg/L. Chlorophyll-a (algae): 72.5 µg/L.
- Clarity
- 1.4 ft
- Phosphorus
- 88.5 µg/L
- Chlorophyll-a
- 72.5 µg/L
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Stays near Crystal Lake
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Watch Crystal Lake’s letter
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Why Crystal 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 Crystal 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.
Crystal Lake is a lake in Anderson County, Kansas.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2016-06-22. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Crystal Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Crystal Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.4 ft of visibility. Phosphorus 88.5 µg/L. Chlorophyll-a 72.5 µg/L. TSI 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 ft | Not graded |
| Phosphorus | 88.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 72.5 µg/L | Not graded |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Crystal Lake
Reservoir Info (USACE NID)
Crystal Lake is a man-made reservoir impounded by the Crystal Lake Dam (completed 1940), built primarily for recreation on the South Fork Pottawatomie Creek-Tr, 30 ft tall and 950 ft long.
- Max storage
- 316.4 ac-ft
- Hazard class
- High
- Owner
- GARNETT, CITY OF AND KDWP
Source: USACE National Inventory of Dams, NID ID KS03002 · Operator website
EPA Impairment Status
Crystal Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM064901 · Official waterbody report
Graded lakes near Crystal Lake
Crystal Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Anderson County
Frequently asked questions about Crystal Lake
Where is Crystal Lake?
- Crystal Lake is a lake in Anderson 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 Crystal Lake?
- Crystal Lake in Anderson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.4 ft visibility. Phosphorus: 88.5 µg/L. Chlorophyll-a (algae): 72.5 µg/L.
Is Crystal Lake safe to swim in?
- The letter is not a swimming clearance. Crystal Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Explore Crystal 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