CASTLE PINES, Colo. (KRDO) - Three left lanes of southbound I-25 have been shut down following a multi-vehicle crash, according to the Colorado State Patrol. CSP says the closure started at milepost 190, north of Castle Pines, and that drivers should use caution and approach the area at lower speeds. It is unclear when the crash occurred. CSP posted an update via X at 6:37 a.m. on August 18. The post Southbound I-25 partially closed north of Cas…