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Water team reports mostly favorable summer: few temperature exceedances, improved Grand Lake clarity
Summary
The county's water‑quality team reported just one 10‑degree weekly stream‑temperature exceedance in 2025, removal of 400 tons of traction sand from the Fraser sediment pond, no cyanobacteria blooms post‑East Troublesome Fire, and improved Grand Lake clarity to a 4.1‑meter average for the season.
Water Quality Manager Catherine Morris and the county's water protection intern summarized summer operations and monitoring results. Morris said Learning By Doing monitoring produced only one weekly temperature exceedance in 2025, a result she called "almost unprecedented." She also said a Denver Water pilot volunteer project released 25 acre‑feet on St. Louis Creek for a short test of temperature effects.
"This year, there was only 1 stream 10 temperature exceedance in 2025," Morris told the board, adding that cooler nighttime air temperatures in late July likely helped conditions. Staff also reported removal of about 400 tons of traction sand from the Fraser sediment pond, no cyanobacteria blooms detected this season at Grand Lake, and an average Grand Lake clarity of about 4.1 meters (13.45 feet) with a 2.88‑meter minimum.
The drought preparedness committee recently set county drought response to Stage 2 and county staff said they will promote voluntary conservation through winter. Commissioners thanked the water team for the detailed monitoring and requested continued updates.
