The State Transportation Commission says the US-77/SH-39 bridge between Purcell and Lexington is expected to be closed for several months. The bridge has cracks so severe it could collapse under its own weight. Engineers are working on plans to repair the cracks and a contract is estimated to be awarded in March. A detour means motorists will drive about 40 minutes out of their way to reach their destination. The Oklahoma Department of Transportation is in the early stages of preparing a replacement for the bridge but construction is likely years away due to the $40 million price tag. The bridge was built in 1938 and carries about 10,000 vehicles daily.