JUNEAU, Alaska (AP) — A federal fisheries agency has raised concerns about the accuracy of some studies being conducted for a massive proposed dam in south-central Alaska.

In a letter to the project manager for the Susitna-Watana dam, the regional administrator of the National Marine Fisheries Service, James Balsiger, said for his agency to effectively review the project, studies must accurately identify fish species, develop accurate habitat models, and use the best available science to understand fish distribution and habitats. He said accurate information also is needed to integrate models without amplifying errors.