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County hears summer water operations update: fewer temperature exceedances but tight flows around Memorial Day
Summary
Water Quality Manager Catherine Morris reported a season with only one stream-temperature exceedance, improvements in Grand Lake clarity since adaptive-management actions began, and concerns about low flows during a late-May diversion period that required coordinated releases and affected agricultural water users.
County water staff on Oct. 28 delivered a detailed review of summer operations, monitoring and coordinated reservoir and diversion activities, reporting generally favorable water-temperature outcomes but noting stress during late-May diversion operations.
Catherine Morris, Grand County water quality manager, said Learning By Doing stream-temperature monitoring recorded only one exceedance in 2025, a marked improvement from several prior warm years. Morris and staff noted a sequence of cooler nighttime temperatures in July–August and several factors that may have contributed, including variable solar radiation and timely releases from storage projects.
Hydrologic forecasts presented by partners showed that Granby Reservoir ended the season below its historical mean storage and that Windy Gap pumping cycles (documented in meeting materials) altered flows in late spring and summer. Morris highlighted a low-flow episode around Memorial Day when combined diversions for the Moffat Tunnel and Colorado-Big Thompson project were high, leaving downstream reaches below target flows and prompting emergency coordination: partners and water-right holders arranged voluntary releases to support recreation and agricultural needs.
Morris also reported progress from the Grand Lake Adaptive Management (GLAM) program: Grand Lake clarity averages and minimum clarity values have improved since adaptive actions began. The county presented before-and-after EagleView imagery of several Emergency Watershed Protection and restoration projects, and staff described emerging restoration results in the Kawuneeche Valley (beaver-dam analogs and post-assisted log structures) designed to slow flows and enhance floodplain connectivity.
Commissioners discussed the Memorial Day low-flow period and asked staff to continue coordination with state and federal partners on measuring devices, reservoir operations, and grants available through Division 5 for flow-measurement equipment. Staff said they will continue monitoring and report if operational changes are necessary.
