Daytime lane closures continue next week at the Twin Tunnels on Interstate 70 at the east end of Idaho Springs for electrical and concrete wall construction.Preparatory blasting also is scheduled to begin next week and continue about every three days. Blast days and times will not be available until the day prior to, or the day of, the blasting operation and will be provided by calling the project hotline at (303) 327-4034 or by checking one of the sources listed below.A 35 mph is in effect while the following lane closures are in place: Monday, February 4•6 a.m. to 3 p.m. - Right lane closed eastbound•10 a.m. to 5 p.m. - Left lane closed westbound•7 a.m. to 5 p.m. - left lane closed eastbound and westbound (This closure is at the west end of Idaho Springs)Tuesday, February 5 •6 a.m. to 3 p.m. - Right lane closed eastbound•11 a.m. to 5 p.m. - Left lane closed westbound•7 a.m. to 5 p.m. - left lane closed eastbound & westbound (This closure is at the west end of Idaho SpringsWednesday, February 6•6 a.m. to 3 p.m. - Right lane closed eastbound•Thursday, February 7•6 a.m. to 3 p.m. - Right lane closed eastbound•Friday, February 8•6 a.m. to 1 p.m. - Right lane closed eastbound In addition, the Colorado Department of Transportation is closing the exit ramp from eastbound Interstate 70 to Hidden Valley (Central City Parkway - Exit 243) on Monday morning, Feb. 11, for frontage road bridge construction. The ramp is scheduled to remain closed for about one month.A temporary structure is needed across Clear Creek to connect the frontage road (CR 314) to eastbound I-70. The road, which is scheduled to open to traffic on Monday, April 1, will be used as the eastbound I-70 detour route while the eastbound Twin Tunnel is widened to three lanes. The detour route while the ramp is closed is eastbound I-70 to the top of Floyd Hill - Beaver Brook, Exit 247 - turning around and then back west on I-70 to Hidden Valley. Adding a third lane to eastbound I-70 from east Idaho Springs to the bottom of Floyd Hill is part of CDOT's strategy at reducing congestion along one of the state's busiest corridors, which, in turn, will improve gas mileage and air quality. For more information: www.coloradodot.info.