Overview

• Laboratory testing on Sept. 8 confirmed adult zebra mussels from samples taken in West and East Lake near Grand Junction and at the adjacent river confluence.
• The state designated the stretch from the 32 Road bridge downstream to the Colorado–Utah border as infested after detecting multiple life stages.
• Officials report this is the first confirmed presence of adult zebra mussels in the Colorado River within Colorado.
• CPW is prioritizing inspections, expanded sampling and public clean‑drain‑dry practices, and it is requesting access to ponds and lakes that draw Colorado River water for checks.
• Since mid‑April, 427 river samples yielded six veliger positives, none were found in the Eagle or Roaring Fork rivers, and a private Eagle County lake was treated with an EPA‑registered copper molluscicide; other infested waters include Highline, Mack Mesa, and West and East Lake.