Olpe City Lake
Lyon County, Kansas75 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)
- 36 ft max depth
- Limited data
Olpe City Lake in Lyon County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.5 ft visibility. Phosphorus: 115 µg/L. Chlorophyll-a (algae): 13 µg/L. Surface area: 75 acres.
- Clarity
- 0.5 ft
- Max depth
- ~36 ft est.
- Area
- 75 acres
- Phosphorus
- 115 µg/L
- Chlorophyll-a
- 13 µg/L
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Watch Olpe City Lake’s letter
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Why Olpe 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 Olpe 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.
Olpe City Lake is a 75-acre lake in Lyon County, Kansas with an estimated average depth of about 36 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-08-06. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Olpe City 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 Olpe City Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 0.5 ft of visibility. Phosphorus 115 µg/L. Chlorophyll-a 13 µg/L. TSI 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.5 ft | Not graded |
| Phosphorus | 115 µg/L | Not graded |
| Chlorophyll-a (Algae) | 13 µg/L | Not graded |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~36 ft est. |
| Average Depth | ~8 ft est. |
| Surface Area | 75 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 Olpe 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 Olpe City Lake
Reservoir Info (USACE NID)
Olpe City Lake is a man-made reservoir impounded by the Olpe City Lake (completed 1965), built primarily for water supply on the Eagle Creek-Tr; earth-type dam, 43 ft tall and 1,700 ft long.
- Surface area
- 75 ac
- Normal storage
- 475 ac-ft
- Max storage
- 879 ac-ft
- Drainage area
- 1.52 sq mi
- Hazard class
- Low
- Owner
- OLPE, CITY OF
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID KS02502 · Operator website
EPA Impairment Status
Olpe 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-LM041001 · Official waterbody report
Graded lakes near Olpe City Lake
Olpe City Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Lyon County
Frequently asked questions about Olpe City Lake
Where is Olpe City Lake?
- Olpe City Lake is a lake in Lyon 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 Olpe City Lake?
- Olpe City Lake in Lyon County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.5 ft visibility. Phosphorus: 115 µg/L. Chlorophyll-a (algae): 13 µg/L. Surface area: 75 acres.
Is Olpe City Lake safe to swim in?
- The letter is not a swimming clearance. Olpe City 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 Olpe City Lake?
- No published bathymetric survey covers Olpe City Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 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 75 acres.
Explore Olpe City Lake across LakeQuality
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Other Lakes in Kansas
Hypereutrophic Lakes in Kansas
Where this data comes from
5 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2014
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)