At the southern end of Co. Hwy. 77 in Brookings County are two bridges: one crossing the main channel of the Big Sioux River, and another smaller overflow structure. Both structures (with portions built in 1925 and reconstructed in 1940) needed replacement. Brookings County applied for replacement grants through the SDDOT BIG program for both structures in December 2016. The smaller overflow structure (89’-6” Three-Span Continuous Concrete Bridge) was awarded a replacement grant in that round of funding. To keep the main crossing bridge (246’-0” Four-Span Prestressed Girder Bridge) on the same schedule as the overflow structure, a “Bid Ready” BIG application was submitted the following December, and the project was awarded a grant. The pair of bridges were let for bidding in the fall of 2018 with construction planned for the 2019 season. The construction completion date was later revised to the fall of 2020 after prolonged flooding and high water prevented work during the 2019 construction season. The smaller overflow structure is complete, and construction on the larger structure is underway.