Lassen County: lake and river algae advisories

8 waters in Lassen County appear in the state's harmful algal bloom records. Waters whose latest record is an advisory come first.

Waters in Lassen County and what the state's latest record says
Water	Latest record
Ash Creek	Caution advisory, last posted Sep 29, 2021. No all-clear recorded.
Dodge Reservoir	Visual observation, last posted Jul 31, 2026. No all-clear recorded.
Eagle Lake	Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
East Creek	Caution advisory, last posted Aug 27, 2026. No all-clear recorded.
Mountain Meadows Reservoir	Caution advisory, last posted Aug 11, 2026. No all-clear recorded.
Rim Rock Lake	Caution advisory, last posted Aug 9, 2018. No all-clear recorded.
Willow Lake	Caution advisory, last posted Sep 3, 2020. No all-clear recorded.
Biscar Reservior	The state's latest record, from Aug 28, 2026, recommends no advisory.