Lake Coldwater
Comanche County, Kansas251 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
Lake Coldwater in Comanche County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 24.5 µg/L. Chlorophyll-a (algae): 13.5 µg/L. Surface area: 250.72 acres.
- Clarity
- 3.6 ft
- Max depth
- ~13 ft est.
- Area
- 251 acres
- Phosphorus
- 24.5 µg/L
- Chlorophyll-a
- 13.5 µg/L
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Watch Lake Coldwater’s letter
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Why Lake Coldwater 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 Coldwater, 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.
Lake Coldwater is a 251-acre lake in Comanche County, Kansas with an estimated average depth of about 13 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2016-06-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Lake Coldwater 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 Lake Coldwater
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 3.6 ft. Phosphorus 24.5 µg/L. Chlorophyll-a 13.5 µg/L. TSI 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft | Not graded |
| Phosphorus | 24.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 13.5 µg/L | Not graded |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~13 ft est. |
| Average Depth | ~11 ft est. |
| Surface Area | 251 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 Lake Coldwater.
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 Lake Coldwater
Reservoir Info (USACE NID)
Lake Coldwater is a man-made reservoir impounded by the Lake Coldwater (completed 1974), built primarily for recreation on the Cavalry Creek-Tr; earth-type dam, 57 ft tall and 3,860 ft long.
- Surface area
- 250.72 ac
- Normal storage
- 2,490.09 ac-ft
- Max storage
- 6,420 ac-ft
- Drainage area
- 43.38 sq mi
- Hazard class
- Significant
- Owner
- COLDWATER, CITY OF
All listed purposes: Recreation;Flood Risk Reduction.
Source: USACE National Inventory of Dams, NID ID KS02465 · Operator website
EPA Impairment Status
Lake Coldwater 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-LM042601 · Official waterbody report
Nearby Lakes in Comanche County
Frequently asked questions about Lake Coldwater
Where is Lake Coldwater?
- Lake Coldwater is a lake in Comanche 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 Lake Coldwater?
- Lake Coldwater in Comanche County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 24.5 µg/L. Chlorophyll-a (algae): 13.5 µg/L. Surface area: 250.72 acres.
Is Lake Coldwater safe to swim in?
- The letter is not a swimming clearance. Lake Coldwater is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Coldwater?
- No published bathymetric survey covers Lake Coldwater, 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 250.72 acres.
Explore Lake Coldwater 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)