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Commissioners approve lower-speed design for 40th St NW, choosing geogrid pavement option
Summary
Mountrail County approved design decisions for the 40th St NW project—selecting a 25 mph alignment estimated at $2.9 million and a pavement section of 5" bituminous on 6" aggregate with geogrid at $1,422,000; the motion passed unanimously.
HDR Engineering presented design alternatives for the 40th St NW project (ND1804 Truck Route west to Broken Arrow Road, ~1.43 miles). The board approved Alternative A for design speed and alignment (25 mph, $2,900,000), Alternative B for pavement (5" bituminous surfacing on a 6" aggregate base with geogrid, $1,422,000), and Alternative B for intersection improvements with adjusted skew. The motion was moved by Commissioner John DeGroot and seconded by Commissioner Wayne Olson and passed with all commissioners voting yes.
The decisions commit the county to a lower-speed alignment and a geogrid-reinforced pavement section for the project’s preliminary design and budgeting. Staff noted the alternatives and associated cost estimates as part of the project record; the vote was recorded during the Oct. 7 meeting.
