Mccormack Lake
Oregon County, Missouri10 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Mccormack Lake. Here is what has been measured.
- Limited data
Mccormack Lake in Oregon County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 11.7 ft visibility. Phosphorus: 6 µg/L. Chlorophyll-a (algae): 3 µg/L. Surface area: 10 acres.
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. Methodology: how these readings are compared.
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 conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Mccormack Lake is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mccormack Lake
These are the measurements Missouri DNR publishes for Mccormack Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11.7 ft. Phosphorus 6 µg/L. Chlorophyll-a 3 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 6µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 3µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Mccormack Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (68°F) to its warmest (79°F).
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
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
Stays via Stay22
Stays near Mccormack Lake
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Top-rated places to stay near Mccormack Lake
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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
Nearby Lakes in Oregon County
Frequently asked questions about Mccormack Lake
Where is Mccormack Lake?
- Mccormack Lake is a lake in Oregon County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Mccormack Lake?
- Mccormack Lake in Oregon County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. 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?
- Nutrient and algae readings are 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Public campgrounds from USGS The National Map Structures, within about 3 miles