Loch Lomond Lake
Loch Lomond Lake in Santa Cruz County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.4 ft visibility.
- Clarity
- 7.4 ft
- Public access
- Yes
Why Loch Lomond Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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, 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, but not 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Loch Lomond Lake is a lake in Santa Cruz County, California. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-07-29. Grade methodology: LakeGrade methodology.
Watch Loch Lomond Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Loch Lomond Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7.4 ft. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Loch Lomond Lake
Compare lakeside cabins, hotels, and vacation rentals near Loch Lomond Lake in Santa Cruz County, California — 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.
Top-rated places to stay near Loch Lomond Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Recreation & Access
- Loch Lomond Recreation AreaPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Loch Lomond Lake
Nearby Lakes in Santa Cruz County
Frequently asked questions about Loch Lomond Lake
Where is Loch Lomond Lake?
- Loch Lomond Lake is a lake in Santa Cruz County, California. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Loch Lomond Lake?
- Loch Lomond Lake in Santa Cruz County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.4 ft visibility.
Is Loch Lomond Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Loch Lomond Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Loch Lomond Lake?
- Loch Lomond Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Loch Lomond Recreation Area. Public access is listed as yes.
Explore Loch Lomond Lake across LakeGrade
More California Lake Rankings
Other Lakes in California
Mesotrophic Lakes in California
Where this data comes from
6 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS6 samples · 2021–2024
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
Named boat-access points from the USGS National Boat Ramps inventory