Lake O the Pines Mid Lake
Marion County, Texas18,700 acresView mapDirections
TCEQ publishes the water-quality measurements for Lake O the Pines Mid Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · pH / acidity
- Public access
Lake O the Pines Mid Lake in Marion County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 2.7 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 41.7 µg/L. Surface area: 18700 acres.
Lake O the Pines Mid Lake is a 18,700-acre highly nutrient-loaded hypereutrophic lake in Marion County, Texas. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 13 public boat landings. Compared to the 3 other monitored lakes in Marion County, Lake O the Pines Mid Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-09-16. Methodology: how these readings are compared.
At about 19,000 acres, Lake O the Pines Mid Lake is large enough that where you stay decides which shore you see most of. It has 13 public boat landings, so a lakefront rental is not the only way to get a boat on the water. Vrbo is where to look for cabins and lake homes around Lake O the Pines Mid Lake, and Booking.com and Expedia search hotels near the lake for your dates.
What Lake O the Pines Mid Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch13 documented ramps
- Camping3 public campgrounds nearby
- Big water18,700 acres
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Lake O the Pines Mid Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Whether Lake O the Pines Mid Lake is safe to swim in today is a call for the Texas Commission on Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake O the Pines Mid Lake
These are the measurements TCEQ publishes for Lake O the Pines Mid Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.7 ft of visibility. Phosphorus 30 µg/L. Chlorophyll-a 41.7 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 30µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 41.7µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 61 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Lake O the Pines Mid Lake
Answers come straight from the public measurements and survey records on this page.
→ Lake O the Pines Mid Lake water level: the live USGS gauge reading
Lake Details
Surface area
18,700 acres
Public access
Yes
Listed by TCEQ
No bathymetric survey has been published for Lake O the Pines Mid Lake, so its depth is not documented here.
Recreation & Access
- FM 3001 BridgePublic
- Lake O' The Pines DamPublic
- Brushy Creek ParkPublic
- Hurricane Creek Recreation AreaPublic
- Lakeside (Pine Harbor)Public
- Holiday HarborPublic
Showing 6 of 13 documented landings from the USGS National Boat Ramps inventory.
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Lake O the Pines Mid Lake
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 Lake O the Pines Mid Lake
Compare lakeside cabins, hotels, and vacation rentals near Lake O the Pines Mid Lake in Marion County, Texas — 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Lake O the Pines Mid Lake are listed below.
Top-rated places to stay near Lake O the Pines Mid Lake
Prices for Oct 23–25, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip? Cabins and lodging at Lake O the Pines Mid Lake → · more Texas lake trips
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Fishing Lake O the Pines Mid Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Worsening+2.75 µg/L/yr6 years
Chlorophyll-a
Worsening+5.92 µg/L/yr6 years
Reservoir Info (USACE NID)
Lake O the Pines Mid Lake is a man-made reservoir impounded by the Ferrells Bridge Dam (completed 1958), built primarily for flood risk reduction on the Cypress Creek; earth-type dam, 97 ft tall and 10,600 ft long.
- Surface area
- 18,700 ac
- Normal storage
- 254,900 ac-ft
- Max storage
- 1,998,740 ac-ft
- Drainage area
- 850 sq mi
- Hazard class
- High
- Owner
- USACE - Fort Worth District
All listed purposes: Flood Risk Reduction;Fish and Wildlife Pond;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID TX00020 · Operator website · Matched by proximity (0.91 km)
EPA Impairment Status
Lake O the Pines Mid Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Other.
Source: EPA ATTAINS assessment unit TX-0403_01 · Official waterbody report
Nearby Lakes in Marion County
Frequently asked questions about Lake O the Pines Mid Lake
Where is Lake O the Pines Mid Lake?
- Lake O the Pines Mid Lake is a lake in Marion County, Texas. Its water-quality measurements are published by TCEQ and shown on this page as reported.
What is the water quality of Lake O the Pines Mid Lake?
- Lake O the Pines Mid Lake in Marion County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 2.7 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 41.7 µg/L. Surface area: 18700 acres.
Is Lake O the Pines Mid Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake O the Pines Mid Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Are there boat ramps on Lake O the Pines Mid Lake?
- Lake O the Pines Mid Lake has 13 documented boat landings in the USGS National Boat Ramps inventory. Named access points include FM 3001 Bridge, Lake O' The Pines Dam, Brushy Creek Park, Hurricane Creek Recreation Area, among others. Public access is listed as yes.
Can I fish at Lake O the Pines Mid Lake?
- Lake O the Pines Mid Lake has 13 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Texas's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Lake O the Pines Mid Lake?
- Lake O the Pines Mid Lake has 3 public campgrounds from USGS The National Map within 5 km, including Lakeside Day Use, Buckhorn Creek, Brushy Creek. 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.
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Where this data comes from
66 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN66 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles