Study finds Sergeant Creek Road vulnerable to frequent overtopping; River Focus recommends road raising and added conveyance

A hydrology and hydraulic study of Russian River and Sergeant Creek presented Thursday to the Kodiak Island Borough Assembly concluded that Sergeant Creek Road is at high risk of frequent overtopping and that targeted work could substantially reduce that risk.

The study, led by River Focus and presented by river restoration engineer Jess Straub, was funded through a FEMA hazard‑mitigation grant administered by the Alaska Division of Homeland Security and Emergency Management and carried out for the borough. River Focus submitted a final report in August 2025 and presented findings publicly as required by the contract.

The report found that during modeled 5‑year flood events water overtops Sergeant Creek Road and produces velocities and depths that exceed safe driving limits; modeled 100‑year events produced multiple feet of overtopping. "Sergeant Creek Road, being the one road in and out, is of high risk with really high consequences if it fails," said Jess Straub, River Focus river restoration engineer. Straub told the assembly the models showed channelization at bridge constrictions and…