Mccormack Lake
Oregon County, Missouri10 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.
- Limited data
Mccormack Lake in Oregon County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.7 ft visibility. Phosphorus: 6 µg/L. Chlorophyll-a (algae): 3 µg/L. Surface area: 10 acres.
- Clarity
- 11.7 ft
- Typical in August
- 68°F
- Area
- 10 acres
- Phosphorus
- 6 µg/L
- Chlorophyll-a
- 3 µg/L
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Stays near Mccormack Lake
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Watch Mccormack Lake’s letter
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Why Mccormack 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 Mccormack 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 Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mccormack Lake is a 10-acre lake in Oregon County, Missouri.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2020-09-10. Grade methodology: LakeQuality methodology.
What Mccormack Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11.7 ft of visibility
- Camping2 public campgrounds nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Mccormack Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 11.7 ft. Phosphorus 6 µg/L. Chlorophyll-a 3 µg/L. TSI 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.7 ft | Not graded |
| Phosphorus | 6 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3 µg/L | Not graded |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Water Temperature
Mccormack Lake typically sits around 68°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 79°F) and coldest in Jun (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 8 field readings (2013–2020) via the EPA Water Quality Portal. See the full Mccormack Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 10 acres |
No bathymetric survey has been published for Mccormack Lake, so its depth is not documented here.
Recreation & Access
Public campgrounds near Mccormack Lake
- Lazy C Trailhead2.2 km
- Greer Crossing3.5 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Mccormack Lake
Reservoir Info (USACE NID)
Mccormack Lake is a man-made reservoir impounded by the Mccormack Dam (completed 1937), built primarily for recreation on the MC CORMACK HOLLOW; earth-type dam, 27 ft tall and 366 ft long.
- Surface area
- 10 ac
- Normal storage
- 88 ac-ft
- Max storage
- 148 ac-ft
- Drainage area
- 4 sq mi
- Hazard class
- Significant
- Owner
- USDA FS
Source: USACE National Inventory of Dams, NID ID MO30004 · Operator website
Graded lakes near Mccormack Lake
Mccormack Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Oregon County
Frequently asked questions about Mccormack Lake
Where is Mccormack Lake?
- Mccormack Lake is a lake in Oregon 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 Mccormack Lake?
- Mccormack Lake in Oregon County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11.7 ft visibility. Phosphorus: 6 µg/L. Chlorophyll-a (algae): 3 µg/L. Surface area: 10 acres.
Is Mccormack Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Mccormack Lake?
- Mccormack Lake typically sits around 68°F at the surface in August, from 8 EPA Water Quality Portal field readings (2013–2020). That is a typical value for the month, not a live reading.
Are there campgrounds on Mccormack Lake?
- Mccormack Lake has 2 public campgrounds from USGS The National Map within 5 km, including Lazy C Trailhead, Greer Crossing. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Mccormack Lake across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Missouri Dept. of Natural Resources
MDNR3 samples · 2020
Analytical methods
- Depth, Secchi disk in meters
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
- 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
Public campgrounds from USGS The National Map Structures, within about 3 miles