The city of Laurel plans to build a rock weir in the Yellowstone River on Saturday to direct water to the intake for the city’s water system.
The 2-foot-tall structure near the Highway 310 bridge could create an impediment to boating, floating and fishing, according to Ryan Holm of Great Western Engineering in Helena.
Earlier this month Laurel built a rock dam across the southern half of the river to divert water toward its intake after the river level dropped below the
That weir protrudes from the river surface. The new structure will extend from the water intake to the north bank of the river and will be entirely submerged, Holm said.
Its top will be about 2.5 feet below the water surface.
Holm anticipates that the weir will create a 55-foot-wide gap between the water intake and north bank of the river, which could be navigable.
Laurel has posted signs upstream and downstream from the construction site, Holm said.