Gridley City Lake
Coffey 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)
- 27 ft max depth
- Limited data
Gridley City Lake in Coffey County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.8 ft visibility. Phosphorus: 47.5 µg/L. Chlorophyll-a (algae): 27 µg/L.
- Clarity
- 1.8 ft
- Max depth
- ~27 ft est.
- Phosphorus
- 47.5 µg/L
- Chlorophyll-a
- 27 µg/L
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Watch Gridley City Lake’s letter
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Why Gridley City 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 Gridley City 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.
Gridley City Lake is a lake in Coffey County, Kansas with an estimated average depth of about 27 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2016-08-03. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Gridley City Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
Water quality measurements for Gridley City Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.8 ft of visibility. Phosphorus 47.5 µg/L. Chlorophyll-a 27 µg/L. TSI 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | Not graded |
| Phosphorus | 47.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 27 µg/L | Not graded |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~27 ft est. |
| Average Depth | ~7 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Gridley City 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 Gridley City Lake
Reservoir Info (USACE NID)
Gridley City Lake is a man-made reservoir impounded by the (completed 1961), built primarily for water supply on the Varvel Creek; earth-type dam, 16 ft tall and 1,500 ft long.
- Normal storage
- 190 ac-ft
- Max storage
- 366 ac-ft
- Drainage area
- 1 sq mi
- Hazard class
- Low
- Owner
- GRIDLEY, CITY OF
Source: USACE National Inventory of Dams, NID ID KS02536 · Operator website · Matched by proximity (0.22 km)
EPA Impairment Status
Gridley City 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-LM045601 · Official waterbody report
Graded lakes near Gridley City Lake
Gridley City Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Coffey County
Frequently asked questions about Gridley City Lake
Where is Gridley City Lake?
- Gridley City Lake is a lake in Coffey 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 Gridley City Lake?
- Gridley City Lake in Coffey County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.8 ft visibility. Phosphorus: 47.5 µg/L. Chlorophyll-a (algae): 27 µg/L.
Is Gridley City Lake safe to swim in?
- The letter is not a swimming clearance. Gridley City Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
How deep is Gridley City Lake?
- No published bathymetric survey covers Gridley City Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 27 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Gridley City 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)