Cedar Valley Lake
Anderson County, Kansas320 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)
- 44 ft max depth
- Limited data
Cedar Valley Lake in Anderson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.7 ft visibility. Phosphorus: 88.5 µg/L. Chlorophyll-a (algae): 41 µg/L. Surface area: 320 acres.
- Clarity
- 2.7 ft
- Max depth
- ~44 ft est.
- Area
- 320 acres
- Phosphorus
- 88.5 µg/L
- Chlorophyll-a
- 41 µg/L
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Watch Cedar Valley Lake’s letter
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Why Cedar Valley 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 Cedar Valley 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.
Cedar Valley Lake is a 320-acre lake in Anderson County, Kansas with an estimated average depth of about 44 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2018-05-29. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Cedar Valley Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), sediment / turbidity. Check local advisories before you swim.
Water quality measurements for Cedar Valley Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.7 ft of visibility. Phosphorus 88.5 µg/L. Chlorophyll-a 41 µg/L. TSI 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 ft | Not graded |
| Phosphorus | 88.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 41 µg/L | Not graded |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~44 ft est. |
| Average Depth | ~12 ft est. |
| Surface Area | 320 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 Cedar Valley 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 Cedar Valley Lake
Reservoir Info (USACE NID)
Cedar Valley Lake is a man-made reservoir impounded by the Cedar Creek Reservoir, built primarily for flood risk reduction on the Cedar Creek; rockfill-type dam, 70 ft tall and 1,750 ft long.
- Surface area
- 320 ac
- Normal storage
- 4,400 ac-ft
- Max storage
- 24,000 ac-ft
- Drainage area
- 63 sq mi
- Hazard class
- High
- Owner
- GARNETT, CITY OF
All listed purposes: Flood Risk Reduction;Water Supply.
Source: USACE National Inventory of Dams, NID ID KS07006 · Operator website · Matched by proximity (0.15 km)
EPA Impairment Status
Cedar Valley 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-LM040701 · Official waterbody report · Matched by proximity (2.11 km)
Graded lakes near Cedar Valley Lake
Cedar Valley Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Anderson County
Frequently asked questions about Cedar Valley Lake
Where is Cedar Valley Lake?
- Cedar Valley 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 Cedar Valley Lake?
- Cedar Valley Lake in Anderson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.7 ft visibility. Phosphorus: 88.5 µg/L. Chlorophyll-a (algae): 41 µg/L. Surface area: 320 acres.
Is Cedar Valley Lake safe to swim in?
- The letter is not a swimming clearance. Cedar Valley Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), sediment / turbidity. Check local advisories before you swim.
How deep is Cedar Valley Lake?
- No published bathymetric survey covers Cedar Valley Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 44 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 320 acres.
Explore Cedar Valley Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2012–2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX8 samples · 2012–2018
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)