Per USAC website:

RAIN FORCES I-96 SPRINT CANCELLATION

Lake Odessa, MI........Rain has forced postponement of Friday night's AMSOIL USAC National Sprint car race at I-96 Speedway. Track and USAC officials are hopeful of finding a suitable date for rescheduling. The series now moves on to Hartford (Mich.) Motor Speedway for Saturday night's scheduled racing program.