However , the arrangement did not last long .
After sections of I - 29 in South Dakota opened up , allowing traffic to utilize bridges crossing the Big Sioux that were built in 1958 , US 77 was moved onto the interstate completely .
The arrangement did not last long .
After sections of I - 29 in South Dakota opened up , allowing traffic to utilize bridges crossing the Big Sioux that were built in 1958 , US 77 was moved onto the interstate completely .