Waukomis Lake
Platte County, Missouri82 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #2 of 3 in the county
- 34 ft max depth
Waukomis Lake in Platte County, Missouri has a water quality grade of B (Good). Water clarity: 4.7 ft visibility. Phosphorus: 26 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Surface area: 82 acres.
- Clarity
- 4.7 ft
- Typical in September
- 78°F
- Max depth
- ~34 ft est.
- Area
- 82 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
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Watch Waukomis Lake’s letter
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Waukomis Lake is a 82-acre productive, nutrient-rich eutrophic lake in Platte County, Missouri with an estimated average depth of about 34 feet. Water quality is graded B based on 2 sampling years through 2022. Overall water quality is declining over recent sampling years. Compared to the 2 other monitored lakes in Platte County, Waukomis Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2022-09-24. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, not a swimming clearance. Waukomis Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water Quality Grade: B (Good)
Murky, only visible to about 4.7 ft. Phosphorus 26 µg/L. Chlorophyll-a 7.2 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.7 ft | Not graded |
| Phosphorus | 26 µg/L | Good |
| Chlorophyll-a (Algae) | 7.2 µg/L | Good |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Waukomis Lake typically sits around 78°F at the surface in September. Summer average is about 82°F. Usually warmest in Jul (about 83°F) and coldest in Apr (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 70 field readings (2010–2022) via the EPA Water Quality Portal. See the full Waukomis Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~34 ft est. |
| Average Depth | ~12 ft est. |
| Surface Area | 82 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Waukomis 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 Waukomis Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.035 m/yr | 3 |
| Phosphorus | ↓ Declining | +3 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.85 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Waukomis Lake is a man-made reservoir impounded by the Lake Waukomis Dam (completed 1968), built primarily for recreation on the TR LINE CREEK; earth-type dam, 68 ft tall and 785 ft long.
- Surface area
- 82 ac
- Normal storage
- 2,292 ac-ft
- Max storage
- 2,292 ac-ft
- Drainage area
- 2.04 sq mi
- Hazard class
- High
- Owner
- LAKE WAUKOMIS HOME ASSN
Source: USACE National Inventory of Dams, NID ID MO10691 · Operator website
EPA Impairment Status
Waukomis Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7072.00 · Official waterbody report
County Ranking
Ranked #2 of 3 lakes in Platte County
Nearby Lakes With Higher Grades
Waukomis Lake holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Platte County
Frequently asked questions about Waukomis Lake
Where is Waukomis Lake?
- Waukomis Lake is a lake in Platte County, Missouri. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Waukomis Lake?
- Waukomis Lake in Platte County, Missouri has a water quality grade of B (Good). Water clarity: 4.7 ft visibility. Phosphorus: 26 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Surface area: 82 acres.
Is Waukomis Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Waukomis Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Waukomis Lake?
- Waukomis Lake typically sits around 78°F at the surface in September, from 70 EPA Water Quality Portal field readings (2010–2022). That is a typical value for the month, not a live reading.
How deep is Waukomis Lake?
- No published bathymetric survey covers Waukomis Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 34 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 82 acres.
Explore Waukomis Lake across LakeQuality
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
60 measurements from 2 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC57 samples · 2020–2022 - Missouri Dept. of Natural Resources
MDNR3 samples · 2020
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
Monitoring station identifiers (2)
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)