Users of the lower American River will notice a significant drop in the water flow over the next few days as workers at the Nimbus Fish Hatchery complete annual work on the fish weir.

At 6:30 a.m. Wednesday, hatchery workers began installing metal pipes that block fish from proceeding any further up river from the hatchery.

The weir is designed to divert fish into the Nimbus Fish Hatchery during the fall run.

To complete the work, crews have to enter the river at the base of the weir.

Water flowing out of the Nimbus Dam was cut overnight from 1,500 cubic feet per second to 800 to make conditions safer for workers.

The Bureau of Reclamation advised anyone using the river to expect water level fluctuations of as much as eight inches along the shore line during the work.

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