Overview
- Boaters first filmed the tree-covered raft in late July and satellite imagery dated July 21 confirmed a roughly 70 m by 140 m floating landmass in Williston Reservoir.
- The feature disappeared from updated satellite snapshots by Aug. 5, then was located resting ashore in the north entrance of the Ospika Arm in mid‑August after drifting about 30 kilometres.
- B.C. Hydro and earth‑science experts say the most likely cause is accumulated shoreline driftwood and rooted debris that were lifted free when the reservoir reached unusually high levels this year.
- The utility says the mass appears intact, does not currently threaten dam operations, and will be monitored for movement or breakup that could create a hazardous debris field requiring intervention.
- Officials warn boaters to stay away because the raft is unstable, and they note that Williston Reservoir’s unusual fullness this season has increased shoreline erosion and floating debris risks for local residents and recreation users.