The Loch Surface Lake
Larimer County, ColoradoView mapDirections
Colorado WQCD publishes the water-quality measurements for The Loch Surface Lake. Here is what has been measured.
- Mesotrophic
- Limited data
Ask about The Loch Surface Lake
Answers come straight from the public measurements and survey records on this page.
The Loch Surface Lake in Larimer County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Chlorophyll-a (algae): 3.4 µg/L.
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The Loch Surface Lake is a mesotrophic lake in Larimer County, Colorado. Compared to the 8 other monitored lakes in Larimer County, The Loch Surface Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2020-12-29. Grade methodology: LakeQuality methodology.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether The Loch Surface Lake is safe to swim in today is a call for the Water Quality Control Division of the Colorado Department of Public Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for The Loch Surface Lake
These are the measurements Colorado WQCD publishes for The Loch Surface Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 3.4 µg/L. TSI 43.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3.4 µg/L | Fair |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Fishing The Loch Surface Lake
Nearby Lakes in Larimer County
Frequently asked questions about The Loch Surface Lake
Where is The Loch Surface Lake?
- The Loch Surface Lake is a lake in Larimer County, Colorado. Its water-quality measurements are published by Colorado WQCD and shown on this page as reported.
What is the water quality of The Loch Surface Lake?
- The Loch Surface Lake in Larimer County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Chlorophyll-a (algae): 3.4 µg/L.
Is The Loch Surface Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore The Loch Surface Lake across LakeQuality
Planning a trip around Rocky Mountain?
The Loch Surface Lake is about 5 miles from Rocky Mountain National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Rocky Mountain →More lakes in Colorado
Other Lakes in Colorado
Mesotrophic Lakes in Colorado
Where this data comes from
13 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Colorado Water Science Center
USGS-CO13 samples · 2020
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.