Lower White Oak Lake
Ouachita County, Arkansas1,000 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↑ up from D at the last regrade
- Eutrophic
- #2 of 3 in the county
- 37 ft max depth
- Public access
- Limited data
Lower White Oak Lake in Ouachita County, Arkansas has a water quality grade of C (Fair). Chlorophyll-a (algae): 25.9 µg/L. Surface area: 1000 acres.
- Max depth
- ~37 ft est.
- Area
- 1,000 acres
- Type
- Eutrophic
- Chlorophyll-a
- 25.9 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Lower White Oak Lake’s letter
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Lower White Oak Lake is a 1,000-acre productive, nutrient-rich eutrophic lake in Ouachita County, Arkansas with an estimated average depth of about 37 feet. Water quality is graded C based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 2 other monitored lakes in Ouachita County, Lower White Oak Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2025-10-28. Grade methodology: LakeQuality methodology.
What Lower White Oak Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water1,000 acres
Swimming Safety
Grade onlyLimited data
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 C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
No clarity data. Chlorophyll-a 25.9 µg/L. TSI 63. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 25.9 µg/L | Fair |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~37 ft est. |
| Average Depth | ~26 ft est. |
| Surface Area | 1,000 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Arkansas has not published bathymetry for Lower White Oak Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- White Oak Lake Dam SitePublic
- White Oak Lake State Park MarinaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lower White Oak Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Chlorophyll-a | ↑ Improving | -8.55 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Lower White Oak Lake is a man-made reservoir impounded by the Lower White Oak Dam (completed 1959), built primarily for recreation on the White Oak Creek; earth-type dam, 30 ft tall and 2,837 ft long.
- Surface area
- 1,000 ac
- Normal storage
- 13,160 ac-ft
- Max storage
- 24,675 ac-ft
- Drainage area
- 27.2 sq mi
- Hazard class
- High
- Owner
- Arkansas Game and Fish Commission
Source: USACE National Inventory of Dams, NID ID AR00633 · Operator website
County Ranking
Ranked #2 of 3 lakes in Ouachita County
Nearby Lakes in Ouachita County
Frequently asked questions about Lower White Oak Lake
Where is Lower White Oak Lake?
- Lower White Oak Lake is a lake in Ouachita County, Arkansas. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lower White Oak Lake?
- Lower White Oak Lake in Ouachita County, Arkansas has a water quality grade of C (Fair). Chlorophyll-a (algae): 25.9 µg/L. Surface area: 1000 acres.
Is Lower White Oak Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lower White Oak Lake?
- No published bathymetric survey covers Lower White Oak Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 1000 acres.
Are there boat ramps on Lower White Oak Lake?
- Lower White Oak Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include White Oak Lake Dam Site, White Oak Lake State Park Marina. Public access is listed as yes.
Explore Lower White Oak Lake across LakeQuality
More Arkansas Lake Rankings
Other Grade C Lakes in Arkansas
Eutrophic Lakes in Arkansas
Where this data comes from
31 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX31 samples · 2023–2025
Analytical methods
- 4500 P J ~ Persulfate Method for Simultaneous Determination of Total Nitrogen and Total Phosphorus
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Turbidity by Nephelometry
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory