As of last night (June 20), CalTrans has implemented a maintenance project on the Arctic Circle portion of Highway 18, from the Big Bear dam west to Lakeview Point. This road work has resulted in overnight closures on Highway 18; closures will be on Sundays through Thursdays, from 10pm to 4am, extending through July 1st. Highway 18 will remain open round the clock on Fridays and Saturdays, though there is the possibility of weekend lane closures during the roughly two-week project. Some of the maintenance work being done includes the repair of guardrails damaged during the winter season, the widening of shoulders, and the cleanup of turnouts along the Arctic Circle.
A couple other CalTrans projects are taking place at the base of the mountain, so just FYI: the northbound Highland Avenue off-ramp at the base of Highway 330 will be closed from 8am to 4pm this week. Also, for those commuting on Highway 38, know that there may be some delays in the Mentone area, as only one lane will be open, from 8am to 4:30pm, to accommodate a sidewalk project expected to take four weeks to complete (as of Wednesday, June 23).
For road updates, closures and construction projects, you can visit the KBHR Big Bear Road Conditions page.
Update: As of Thursday, CalTrans is implementing another road project at the base of the mountain, and this will impact travelers coming down the mountain on Highway 330. On Thursday night, June 24 and Friday night, June 25, there will be overnight closures on the Highway 330 connectors to the 210 Freeway. Detours will be in place to access the 210 during work hours, which will be from 8pm to 5am.
Update: As of July 2, all of these mountain-area projects (save for the ongoing Big Bear bridge replacement project) are complete. CalTrans crews may revisit the Arctic Circle for additional maintenance on a yet-to-be scheduled date later this summer.