Hazel Hill Lake by Dam
Johnson County, Missouri71 acresView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- Impaired · Algal growth
- #4 of 4 in the county
- 39 ft max depth
- Public access
Hazel Hill Lake by Dam in Johnson County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 59.3 µg/L. Chlorophyll-a (algae): 28 µg/L. Surface area: 71 acres.
- Clarity
- 2 ft
- Typical in August
- 83°F
- Max depth
- ~39 ft est.
- Area
- 71 acres
- Type
- Eutrophic
- Phosphorus
- 59.3 µg/L
- Chlorophyll-a
- 28 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Hazel Hill Lake by Dam
Compare lakeside cabins, hotels, and vacation rentals near Hazel Hill Lake by Dam in Johnson County, Missouri — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Hazel Hill Lake by Dam are listed below.
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Hazel Hill Lake by Dam is a 71-acre productive, nutrient-rich eutrophic lake in Johnson County, Missouri with an estimated average depth of about 39 feet. Water quality is graded D based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 3 other monitored lakes in Johnson County, Hazel Hill Lake by Dam ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-06. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
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 D is nutrients and algae, not a swimming clearance. Hazel Hill Lake by Dam is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2 ft of visibility. Phosphorus 59.3 µg/L. Chlorophyll-a 28 µg/L. TSI 64. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 59.3 µg/L | Poor |
| Chlorophyll-a (Algae) | 28 µg/L | Poor |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Hazel Hill Lake by Dam typically sits around 83°F at the surface in August. Summer average is about 83°F. Usually warmest in Jul (about 86°F) and coldest in May (about 74°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 60 field readings (2010–2024) via the EPA Water Quality Portal. See the full Hazel Hill Lake by Dam water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~39 ft est. |
| Average Depth | ~11 ft est. |
| Surface Area | 71 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Hazel Hill Lake by Dam.
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 Hazel Hill Lake by Dam
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.012 m/yr | 4 |
| Phosphorus | ↑ Improving | -2.41 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -8.3 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Hazel Hill Lake by Dam is a man-made reservoir impounded by the Hazel Hill Community Dam (completed 1989), built primarily for recreation on the TR-WALNUT CREEK; earth-type dam, 38 ft tall and 1,112 ft long.
- Surface area
- 71 ac
- Normal storage
- 544 ac-ft
- Max storage
- 544 ac-ft
- Drainage area
- 2.34 sq mi
- Hazard class
- Significant
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO20785 · Operator website · Matched by proximity (0.05 km)
EPA Impairment Status
Hazel Hill Lake by Dam 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_7387.00 · Official waterbody report · Matched by proximity (0.48 km)
Regulated Pollution Sources Nearby
8 EPA-permitted facilities operate within about 5 miles of Hazel Hill Lake by Dam under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 6 facilities have a reported Clean Water Act violation in the past three years.
- Warrensburg West WwtpWarrensburg · 4.4 mi away · NPDES MO0055905MajorRecent violation
- Riverwood Ii Estates WwtfWarrensburg · 3.4 mi away · NPDES MO0113905Recent violation
- Four Seasons North Mhp WwtfWarrensburg · 4.2 mi away · NPDES MO0113603Recent violation
- Crabtree Country Subdivision WwtfWarrensburg · 4.4 mi away · NPDES MO0126462Recent violation
- Skyhaven Motel And Convenience StorewwtfWarrensburg · 4.7 mi away · NPDES MO0110108Recent violation
- Beverly Hills Mobile Home ParkWarrensburg · 4.8 mi away · NPDES MO0141038Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #4 of 4 lakes in Johnson County
Nearby Lakes With Higher Grades
Hazel Hill Lake by Dam holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Johnson County
Frequently asked questions about Hazel Hill Lake by Dam
Where is Hazel Hill Lake by Dam?
- Hazel Hill Lake by Dam is a lake in Johnson County, Missouri. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hazel Hill Lake by Dam?
- Hazel Hill Lake by Dam in Johnson County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 2 ft visibility. Phosphorus: 59.3 µg/L. Chlorophyll-a (algae): 28 µg/L. Surface area: 71 acres.
Is Hazel Hill Lake by Dam safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Hazel Hill Lake by Dam is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
What is the water temperature of Hazel Hill Lake by Dam?
- Hazel Hill Lake by Dam typically sits around 83°F at the surface in August, from 60 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Hazel Hill Lake by Dam?
- No published bathymetric survey covers Hazel Hill Lake by Dam, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 39 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 71 acres.
Explore Hazel Hill Lake by Dam across LakeQuality
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Other Grade D Lakes in Missouri
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Where this data comes from
85 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC84 samples · 2020–2024 - Missouri Dept. of Natural Resources
MDNR1 sample · 2023
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)