State Highway 38 (SHâÂÂ38) is a eastâÂÂwest state highway in Oneida County, Idaho, United States, that connects 2100 West and Old Highway 37 (northwest of Holbrook) with Interstate 15 (IâÂÂ15), just east of Malad City.
SHâÂÂ38 begins at an intersection with Old Highway 37 (also known as Rockland Highway and North Holbrook Road) and 2100 West (also known as Stone Highway) northwest of Holbrook. From the western terminus of SHâÂÂ38 the Old Highway 37, former routing of SH-37, continues northwest to the Power County line and the southern terminus of SHâÂÂ37. From its western terminus, SHâÂÂ38 heads east through a rural area between sections of the Curlew National Grassland. It takes a more crooked route east of Holbrook, intersecting Arbon Valley Road. From there, the SHâÂÂ38 enters mountainous terrain, passing Holbrook Summit at an elevation of . After passing through the mountains, SHâÂÂ38 enters a rural area and passes through the unincorporated community of Pleasantview. SHâÂÂ38 then turns northeast toward Malad City, passing south of the Malad City Airport. After entering Malad City, the route turns eastward, passing through a mixed residential and business district. SHâÂÂ38 leaves the Malad City limits before reaching its eastern terminus with IâÂÂ15 at a diamond interchange. From the interchange, Old Highway 191 (formerly U.S. Route 191) continues north toward Downey.
Between 1927 and 1937, the SHâÂÂ38 designation was assigned to the former SH-32 that began in Roy and headed east and then northeast to Arbon, north to Pauline along modern-day Arbon Highway and then north on the modern-day Bannock Highway to Crystal, and on to terminate in at the former routing of US-91 in Portneuf.
The route which is now SHâÂÂ38 was designated as part of former routing of SH-33 by 1927. Between 1927 and 1937, SHâÂÂ33 was changed to SHâÂÂ37; the north-south route through Malad City had also been designated as SH-21, but by 1937 it had been changed to SH-36. By 1956, the southern terminus of SHâÂÂ38 had changed from SHâÂÂ37 in Roy to SHâÂÂ37 east of Holbrook via Buist to Arbon. Eventually, the routing of SHâÂÂ38 was changed to its current route, with the roads through Buist, Arbon, and Crystal to Portneuf being entirely removed from the state highway system.