Brock Lake
Van Buren County, ArkansasView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Limited data
Brock Lake in Van Buren County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.6 ft visibility. Phosphorus: 32.5 µg/L. Chlorophyll-a (algae): 12.6 µg/L.
- Clarity
- 2.6 ft
- Phosphorus
- 32.5 µg/L
- Chlorophyll-a
- 12.6 µg/L
- Trend
- ↑ Improving
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Stays near Brock Lake
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Watch Brock Lake’s letter
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Why Brock 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 Brock Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. 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 ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Brock Lake is a lake in Van Buren County, Arkansas. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2014-11-19. Grade methodology: LakeQuality methodology.
What Brock Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Brock Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.6 ft of visibility. Phosphorus 32.5 µg/L. Chlorophyll-a 12.6 µg/L. TSI 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | Not graded |
| Phosphorus | 32.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 12.6 µg/L | Not graded |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
Public campgrounds near Brock Lake
- Brock Creek Cg2.6 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 Brock Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.01 m/yr | 2 |
| Phosphorus | ↑ Improving | -8.5 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -4.7 µg/L/yr | 2 |
Graded lakes near Brock Lake
Brock Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Van Buren County
Frequently asked questions about Brock Lake
Where is Brock Lake?
- Brock Lake is a lake in Van Buren County, Arkansas. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Brock Lake?
- Brock Lake in Van Buren County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.6 ft visibility. Phosphorus: 32.5 µg/L. Chlorophyll-a (algae): 12.6 µg/L.
Is Brock Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there campgrounds on Brock Lake?
- Brock Lake has 1 public campground from USGS The National Map within 5 km, including Brock Creek Cg. 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 Brock Lake across LakeQuality
4 documented falls within 23.2 mi, nearest Falling Water Falls
Species activity outlook by water temperature and season
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Arkansas's cleanest and most-polluted lakes, ranked
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Where this data comes from
35 measurements from 1 monitoring station, 2013–2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Arkansas Water Science Center
USGS-AR35 samples · 2013–2014
Analytical methods
- Secchi disk method
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
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