Happy Holler Lake
Andrew County, Missouri62 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 · Algal growth
- Public access
- Limited data
Happy Holler Lake in Andrew County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 63 µg/L. Chlorophyll-a (algae): 12.7 µg/L. Surface area: 62 acres.
- Area
- 62 acres
- Public access
- Yes
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Watch Happy Holler Lake’s letter
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Why Happy Holler 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 Happy Holler Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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 Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Happy Holler Lake is a 62-acre lake in Andrew County, Missouri. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-07-29. Grade methodology: LakeQuality methodology.
What Happy Holler Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Happy Holler Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water quality measurements for Happy Holler Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 63 µg/L. Chlorophyll-a 12.7 µg/L. TSI 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 63 µg/L | Not graded |
| Chlorophyll-a (Algae) | 12.7 µg/L | Not graded |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 62 acres |
| Public Access | Yes |
No bathymetric survey has been published for Happy Holler Lake, so its depth is not documented here.
Recreation & Access
- Happy Holler Lake Conservation AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Happy Holler Lake
Reservoir Info (USACE NID)
Happy Holler Lake is a man-made reservoir impounded by the Happy Holler Dam (completed 1995), built primarily for recreation on the PLATTE RIVER; earth-type dam, 43 ft tall and 843 ft long.
- Surface area
- 62 ac
- Normal storage
- 805 ac-ft
- Max storage
- 805 ac-ft
- Drainage area
- 3.41 sq mi
- Hazard class
- High
- Owner
- MO DEPT OF CONSERVATION
All listed purposes: Recreation;Fish and Wildlife Pond.
Source: USACE National Inventory of Dams, NID ID MO12380 · Operator website
EPA Impairment Status
Happy Holler 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_7644.00 · Official waterbody report
Graded lakes near Happy Holler Lake
Happy Holler Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Andrew County
Frequently asked questions about Happy Holler Lake
Where is Happy Holler Lake?
- Happy Holler Lake is a lake in Andrew County, Missouri. 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 Happy Holler Lake?
- Happy Holler Lake in Andrew County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 63 µg/L. Chlorophyll-a (algae): 12.7 µg/L. Surface area: 62 acres.
Is Happy Holler Lake safe to swim in?
- The letter is not a swimming clearance. Happy Holler Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Are there boat ramps on Happy Holler Lake?
- Happy Holler Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Happy Holler Lake Conservation Area. Public access is listed as yes.
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Where this data comes from
4 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC4 samples · 2024
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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
Named boat-access points from the USGS National Boat Ramps inventory