Lake Opines
Marion County, TexasView mapDirections
Nutrients and algae run well above the regional average.
↓ down from D at the last regrade
- Hypereutrophic
- Impaired · pH / acidity
- #4 of 4 in the county
- Public access
Lake Opines in Marion County, Texas has a water quality grade of F (Algae-prone). Water clarity: 2 ft visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 59.2 µg/L.
- Clarity
- 2 ft
- Type
- Hypereutrophic
- Phosphorus
- 50 µg/L
- Chlorophyll-a
- 59.2 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
Stays via Stay22
Stays near Lake Opines
Compare lakeside cabins, hotels, and vacation rentals near Lake Opines 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 grade measures nutrients and algae, not lodging — cabins and rentals around Lake Opines are listed below.
Top-rated places to stay near Lake Opines
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Watch Lake Opines’s letter
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Lake Opines is a highly nutrient-loaded hypereutrophic lake in Marion County, Texas. Water quality is graded F based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 4 public boat landings. Compared to the 3 other monitored lakes in Marion County, Lake Opines ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-09-16. Grade methodology: LakeQuality methodology.
What Lake Opines is good for
From access and monitoring records, not editorial picks.
- Boat launch4 documented ramps
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 F is nutrients and algae, not a swimming clearance. Lake Opines is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 2 ft of visibility. Phosphorus 50 µg/L. Chlorophyll-a 59.2 µg/L. TSI 66. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 50 µg/L | Fair |
| Chlorophyll-a (Algae) | 59.2 µg/L | Poor |
| Trophic State Index (TSI) | 66 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Recreation & Access
- Wisteria RoadPublic
- Pop's LandingPublic
- Oak HillPublic
- Mims Chapel ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Opines
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.023 m/yr | 6 |
| Phosphorus | ↓ Declining | +6.61 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +3.14 µg/L/yr | 6 |
EPA Impairment Status
Lake Opines is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit TX-0403_03 · Official waterbody report · Matched by proximity (1.27 km)
County Ranking
Ranked #4 of 4 lakes in Marion County
Nearby Lakes With Higher Grades
Lake Opines holds Grade F. 3 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 Marion County
Frequently asked questions about Lake Opines
Where is Lake Opines?
- Lake Opines is a lake in Marion County, Texas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Opines?
- Lake Opines in Marion County, Texas has a water quality grade of F (Algae-prone). Water clarity: 2 ft visibility. Phosphorus: 50 µg/L. Chlorophyll-a (algae): 59.2 µg/L.
Is Lake Opines safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Lake Opines 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 Opines?
- Lake Opines has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Wisteria Road, Pop's Landing, Oak Hill, Mims Chapel Park. Public access is listed as yes.
Explore Lake Opines across LakeQuality
More Texas Lake Rankings
Other Grade F Lakes in Texas
Hypereutrophic Lakes in Texas
Where this data comes from
60 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
TCEQMAIN60 samples · 2020–2025
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