BAILEYVILLE — Alewives are expected to swim upriver of the Grand Falls dam on eastern Maine’s St. Croix River this week for the first time in 22 years.

Lawmakers passed a law this spring allowing the fish, also known as river herring, to swim upriver of the dam, overturning an earlier law closed a fish passage at the Grand Falls dam to alewives. The earlier law was passed at the request of fishing guides who maintained the fish posed a threat to smallmouth bass populations in waters upriver of the dam.

As of Monday, more than 600 alewives had swum past another dam nine miles downriver from the Grand Falls dam.

Supporters of the new law say alewives will likely arrive at Grand Falls dam this week, possibly as early as Monday.

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