Loch Lomond Lake
Benton County, Arkansas477 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 53 ft max depth
- Public access
- Limited data
Loch Lomond Lake in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Surface area: 477 acres.
- Max depth
- ~53 ft est.
- Area
- 477 acres
- Phosphorus
- 20 µg/L
- Chlorophyll-a
- 8.5 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Loch Lomond Lake’s letter
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Why Loch Lomond 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 Loch Lomond Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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.
Loch Lomond Lake is a 477-acre lake in Benton County, Arkansas with an estimated average depth of about 53 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled 2016-05-24. Grade methodology: LakeQuality methodology.
What Loch Lomond Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Loch Lomond Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 20 µg/L. Chlorophyll-a 8.5 µg/L. TSI 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 20 µg/L | Not graded |
| Chlorophyll-a (Algae) | 8.5 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~53 ft est. |
| Surface Area | 477 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 Loch Lomond 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
- GrantonPublic
- Tiree ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Loch Lomond Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -0.6 µg/L/yr | 4 |
| Chlorophyll-a | → Stable | +0.07 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Loch Lomond Lake is a man-made reservoir impounded by the Loch Lomond Dam (completed 1981), built primarily for recreation on the Sugar Creek-Tr; earth-type dam, 80 ft tall and 1,770 ft long.
- Surface area
- 477 ac
- Normal storage
- 14,093 ac-ft
- Max storage
- 23,099 ac-ft
- Drainage area
- 13.2 sq mi
- Hazard class
- High
- Owner
- Bella Vista Village Property Owners Association
Source: USACE National Inventory of Dams, NID ID AR01408 · Operator website
Graded lakes near Loch Lomond Lake
Loch Lomond Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Benton County
Frequently asked questions about Loch Lomond Lake
Where is Loch Lomond Lake?
- Loch Lomond Lake is a lake in Benton County, Arkansas. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Loch Lomond Lake?
- Loch Lomond Lake in Benton County, Arkansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Surface area: 477 acres.
Is Loch Lomond Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Loch Lomond Lake?
- No published bathymetric survey covers Loch Lomond Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 53 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 477 acres.
Are there boat ramps on Loch Lomond Lake?
- Loch Lomond Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Granton, Tiree Park. Public access is listed as yes.
Explore Loch Lomond Lake across LakeQuality
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Where this data comes from
35 measurements from 1 monitoring station, 2012–2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Arkansas Department of Environmental Quality
ARDEQH2O_WQX35 samples · 2012–2016
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
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