Survey No. Name (as assigned by HAER) Status Type [2] Built Documented Carries Crosses Location County Coordinates ID-1 Murtaugh Bridge Replaced Pratt truss 1916 1980 Murtaugh Road Snake River Murtaugh and Hazelton Twin Falls and Jerome 42°29′58″N 114°09′13″W / 42.49944°N 114.15361°W / 42.49944; -114.15361 (Murtaugh Bridge ) ID-3 Twin Falls–Jerome Bridge Replaced Cantilever 1927 1977 US 93 Snake River Twin Falls and Jerome Twin Falls and Jerome 42°36′00″N 114°27′13″W / 42.60000°N 114.45361°W / 42.60000; -114.45361 (Twin Falls–Jerome Bridge ) ID-4 Thatcher Bridge Replaced Warren truss 1910 1982 Thatcher Road Bear River Thatcher Franklin 42°24′30″N 111°44′01″W / 42.40833°N 111.73361°W / 42.40833; -111.73361 (Thatcher Bridge ) ID-5 Bonner's Ferry Bridge Replaced Pratt truss 1933 1980 US 2 / US 95 Kootenay River Bonners Ferry Boundary 48°41′59″N 116°18′48″W / 48.69972°N 116.31333°W / 48.69972; -116.31333 (Bonner's Ferry Bridge ) ID-6 Fall River Bridge Replaced Howe truss 1930 1983 CCC Camp Road Fall River Ashton Fremont 44°04′06″N 111°14′45″W / 44.06833°N 111.24583°W / 44.06833; -111.24583 (Fall River Bridge ) ID-7 Oldtown Bridge Replaced Parker truss 1927 1984 US 2 Pend Oreille River Oldtown Bonner 48°11′06″N 117°02′04″W / 48.18500°N 117.03444°W / 48.18500; -117.03444 (Oldtown Bridge ) ID-8 Burton Road Bridge Replaced Pratt truss 1910 1985 SR 93879A (Burton Road) Weiser River Cambridge Washington 44°32′44″N 116°39′20″W / 44.54556°N 116.65556°W / 44.54556; -116.65556 (Burton Road Bridge ) ID-12 Hot Springs Bridge Replaced Pratt truss 1910 1987 Blackstone–Grasmere Road Bruneau River Bruneau Owyhee 42°47′30″N 115°43′07″W / 42.79167°N 115.71861°W / 42.79167; -115.71861 (Hot Springs Bridge ) ID-13 East Dingle Bridge Replaced Pratt truss 1910 1987 Hunter Hill Road Bear River Montpelier Bear Lake 42°13′45″N 111°14′47″W / 42.22917°N 111.24639°W / 42.22917; -111.24639 (East Dingle Bridge ) ID-14 Midvale Bridge Replaced Pratt truss 1911 1986 Bridge Street Weiser River Midvale Washington 44°28′14″N 116°43′56″W / 44.47056°N 116.73222°W / 44.47056; -116.73222 (Midvale Bridge ) ID-19 McCammon Overhead and River Crossing Bridge Demolished Reinforced concrete T-beam 1936 1990 I-15 BL Portneuf River and Union Pacific Railroad McCammon Bannock 42°39′35″N 112°11′40″W / 42.65972°N 112.19444°W / 42.65972; -112.19444 (McCammon Overhead & River Crossing Bridge ) ID-21 Rock Creek Bridge Replaced Viaduct 1920 1992 SH-74 (Shoshone Street) Rock Creek Twin Falls Twin Falls 42°33′02″N 114°28′37″W / 42.55056°N 114.47694°W / 42.55056; -114.47694 (Rock Creek Bridge ) ID-27-F Arrowrock Dam, Spillway Bridge Bypassed Pratt truss 1915 1999 Arrowrock Dam access road Boise River Twin Springs Boise 43°35′51″N 115°55′29″W / 43.59750°N 115.92472°W / 43.59750; -115.92472 (Arrowrock Dam, Spillway Bridge ) ID-32-D Washington Water Power Company Post Falls Power Plant, Concrete Arch Bridge Extant Reinforced concrete open-spandrel arch 1929 1996 West 4th Avenue Spokane River Post Falls Kootenai 47°42′41″N 116°57′22″W / 47.71139°N 116.95611°W / 47.71139; -116.95611 (Washington Water Power Company Post Falls Power Plant, Concrete Arch Bridge ) ID-32-E Washington Water Power Company Post Falls Power Plant, Irrigation Canal Bridge Extant Reinforced concrete cast-in-place slab 1930 1996 West 4th Avenue Irrigation canal Post Falls Kootenai 47°42′40″N 116°57′12″W / 47.71111°N 116.95333°W / 47.71111; -116.95333 (Washington Water Power Company Post Falls Power Plant, Irrigation Canal Bridge ) ID-35 King Hill Bridge Replaced Pratt truss 1910 1998 SR 93808A (Pitchfork Road) Snake River King Hill Elmore 43°00′06″N 115°12′32″W / 43.00167°N 115.20889°W / 43.00167; -115.20889 (King Hill Bridge ) ID-38 Blackfoot River Crossing Bridge Replaced Warren truss 1900 1999 North Trail Creek Road Blackfoot River Soda Springs Caribou 42°46′03″N 111°26′49″W / 42.76750°N 111.44694°W / 42.76750; -111.44694 (Blackfoot River Crossing Bridge ) ID-41 Camas Prairie Railroad, Second Subdivision Extant Trestle 1908 2002 Camas Prairie Railroad Lawyer Creek et al. Spalding Nez Perce 46°12′06″N 116°25′16″W / 46.20167°N 116.42111°W / 46.20167; -116.42111 (Camas Prairie Railroad, Second Subdivision ) ID-42 Clark Fork Vehicle Bridge Bypassed Parker truss 1919 2002 South River Road Clark Fork River Clark Fork Bonner 48°08′10″N 116°10′23″W / 48.13611°N 116.17306°W / 48.13611; -116.17306 (Clark Fork Vehicle Bridge )