• Rafters on the Alganak Wild River

    Alagnak

    Wild River Alaska

Hydrologic Activity

Riverbank erosion on the Alagnak

Increased erosion resulting from increased motorboat activity on the Alagnak is a concern of river managers.

USGS-WRD Photo

Erosion of riverbanks from river currents and waves is a natural process. However, increased wave action due to motorboats has become a serious concern over the years with an increase in visitation to the Alagnak Wild River. Actively eroding and denuded riverbanks are especially vulnerable to further wave action as high banks composed of loose sand and gravel are undercut. Visitors using motorboats can help reduce continued erosion by significantly slowing their craft in areas where erosion is evident.

Did You Know?

Wave action from increased motorboat use on the Alagnak Wild River threatens archaeological sites.

While current and wave erosion is a natural process, increased erosion from motorboat wakes has become one of the greatest threats to archaeological sites along the banks of the Alagnak Wild River. Boaters can reduce the destructive process by slowing their crafts in areas where erosion is evident.