To achieve this, the site was excavated and the seeping water was pumped from the area. An intricate drainage system, water pump and retaining wall are used to protect the freeway from the Sacramento River. However, the system slowly clogged up over the years with sand and silt buildup Major repair work of the Boat Section began on May 30, 2008. The construction was to take 40 days to complete, requiring complete northbound and southbound closures on an alternating schedule. Exit list Newhall Pass truck route The I-5 truck route through the Newhall Pass Interchange in Sylmar has its own separate exits. The route runs from the I-210 interchange to north of the SR 14 interchange. Related routes There are six signed auxiliary Interstate Highways associated with I-5 in California: I-105 runs from SR 1 near El Segundo and Los Angeles International Airport (LAX) east to I-605 in Norwalk. I-205 runs from I-580 to I-5, forming the north side of a triangle around Tracy. I-405 is a bypass route of I-5, running along the southern and western parts of Greater Los Angeles from Irvine north to near San Fernando. I-505 runs from I-80 in Vacaville north to I-5 near Dunnigan. I-605 runs from I-405 and SR 22 in Seal Beach north to I-210 in Duarte. I-805 is a bypass route of I-5 in the San Diego area, running from the San Diego district of San Ysidro near the Mexico–U.S. border to near Del Mar. There is also one unsigned auxiliary Interstate Highway: I-305 runs along US 50 from I-80 in West Sacramento to SR 99 in Sacramento. There is one future auxiliary Interstate Highway: SR 905 from I-5 in San Diego to the Mexico–U.S. border in Otay Mesa is proposed to become I-905. There are also several business routes of Interstate 5 in California, primarily parts of the original routing of US 99. See also References External links Interstate 5 at Interstate-Guide.com Interstate 5 at California @ AARoads.com Caltrans: Interstate 5 highway conditions Interstate 5 at California Highways History of the Northern Los Angeles County section of Interstate 5 (Photos, text, TV shows) Interstate 5 in the Los Angeles Area US 99 Tour in Southern California 05 California 005 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate 05 Interstate