Oldest Bridges in Idaho

The oldest bridge in Idaho is the Wildhorse Road over Wildhorse River in Adams County, built in 1908.

Age, drawn to scale

The 10 oldest in Idaho, one timeline

187519001925195019752000today

1Wildhorse Road over Wildhorse RiverID · 1908 · 30/day 2Sperry Grade RD over Potlatch Rvr(sperry Br)ID · 1908 · 170/day 3Railroad Grade RD over St. Joe RiverID · 1908 · 40/day 4Stc 5711;moon Pass over Big Dick CreekID · 1909 · 370/day 5Stc 5711;moon Pass over Squaw CreekID · 1909 · 370/day 6Stc 3007;unity RD over Weiser RiverID · 1910 · 180/day 7Potlatch Road over Elk Creek TrestleID · 1912 · 100/day 8Potlatch Road over Big Creek TrestleID · 1912 · 100/day 9Potlatch Road over Agatha Creek TrestleID · 1912 · 100/day 10Potlatch Road over Black Prince TrestleID · 1912 · 100/day For scale: the Brooklyn BridgeNY · 1883 · 111k/day

Each bar runs from the year the bridge was built to today, colored by its overall condition (green good, orange fair, red poor). A white notch marks a recorded reconstruction; many of these bridges have been rebuilt or widened more than once, and the inventory keeps only the most recent date. Daily traffic is the latest count.

When the bridges were built

every bridge in Idaho by the decade it was built

Before 1900pre—

1900s'00—

1910s'1050%

1920s'2024%

152

1930s'3021%

1940s'4011%

433

1950s'5012%

965

1960s'606%

911

1970s'704%

496

1980s'804%

439

1990s'903%

392

2000s'001%

465

2010s'101%

236

2020s'200%

bridges builtshare rated poor

goodfairpoor

Bars are stacked by today's condition rating. 4,643 bridges are counted. Build years before 1900 are counted only when credible.

The Oldest Bridges in Idaho

Bridge	County	Built	Rebuilt	Material	Daily Traffic	Condition
Wildhorse Road over Wildhorse River	Adams	1908	2009	Steel	30	Poor
Sperry Grade RD over Potlatch Rvr(sperry Br)	Nez Perce	1908		Steel	170	Fair
Railroad Grade RD over St. Joe River	Benewah	1908		Steel	40	Fair
Stc 5711;moon Pass over Big Dick Creek	Shoshone	1909	1989	Steel	370	Poor
Stc 5711;moon Pass over Squaw Creek	Shoshone	1909	1989	Steel	370	Fair
Stc 3007;unity RD over Weiser River	Washington	1910	2000	Steel	180	Poor
Potlatch Road over Elk Creek Trestle	Shoshone	1912	1991	Wood or Timber	100	Poor
Potlatch Road over Big Creek Trestle	Shoshone	1912	1991	Steel	100	Poor
Potlatch Road over Agatha Creek Trestle	Shoshone	1912	1991	Wood or Timber	100	Poor
Potlatch Road over Black Prince Trestle	Shoshone	1912	1991	Wood or Timber	100	Poor
Brooklyn Bridge over I278 Fdr Drive Fdr Dri		1883	2016		110,939	Poor
Railroad Grade RD over Mercury Creek	Benewah	1912	1991	Wood or Timber	40	Fair
Railroad Grade RD over Bond Creek	Benewah	1912	1991	Wood or Timber	40	Fair
Old Mil. Rr Grade over Slough Bridge	Shoshone	1912	1991	Wood or Timber	15	Poor
Old Mil. Rr Grade over Trout Creek	Shoshone	1912	1991	Steel	15	Poor
Lake Way over North Fork Payette River	Valley	1913		Steel	100	Fair
North Birch Street over Little Wood River	Lincoln	1913	2000	Steel	200	Poor
Shafer Creek Road over Shafer Creek	Boise	1914		Steel	20	Poor
1200 South Road over Clover Creek	Gooding	1915	1987	Steel	50	Fair
1400 East Road over High Line Canal	Twin Falls	1915	1964	Steel	20	Fair
College Street over Paradise Creek	Latah	1915		Concrete	2,600	Fair
Stc 7664;w. 6th ST over Paradise Creek	Latah	1916	1939	Concrete	7,500	Fair
Airport Road over Bear River	Bear Lake	1916	1984	Steel	50	Fair
Stc 8217;cove Road over Weiser River	Washington	1917	1992	Steel	490	Poor
Access Rd; Park RD over Lawyers Creek;park Br	Lewis	1917	1960	Steel	50	Poor
Power Line Road over New York Canal	Canyon	1919	1987	Concrete	660	Fair
Elk Creek Road over Moon Gulch;ne.kellogg Br	Shoshone	1919		Concrete	50	Fair
Stc2739;3800 E. RD over Lateral 10	Twin Falls	1920	1940	Concrete	2,900	Fair
100 West ST over St. Charles CR N. Bridge	Bear Lake	1920	1931	Steel	50	Fair
Timberline Road over E. Fk. Wood River	Blaine	1920	1950	Steel	40	Fair
200 South Road over Camas Creek	Camas	1920	1950	Steel	30	Poor
North Apple Street over Little Wood River	Lincoln	1920	2001	Steel	200	Poor
Brownlee Road over Payette River;gardena Br	Boise	1920	1960	Steel	350	Fair
Old Highway 95 over Slate Creek	Idaho	1920		Steel	50	Fair
Maple Street over Long Hollow Creek	Lewis	1920	1965	Concrete Continuous	70	Fair
Highline Arrow RD over Potlatch R(arrow Jct Br)	Nez Perce	1920		Steel	90	Poor
Lulu Street over Big Canyon Creek	Nez Perce	1920		Steel	50	Fair
2800 N over E.branch Big Lost River	Butte	1920	1991	Prestressed Concrete	40	Fair
2900n over E.branch Big Lost River	Butte	1920	1990	Prestressed Concrete	260	Fair
Abstein Lane over E.fk. Of S.fk.salmon Rvr	Valley	1920	1981	Steel	30	Fair
River Road over Salmon Falls Creek	Twin Falls	1921		Concrete	30	Fair
Strawberry Road over Beaver Creek	Adams	1922		Concrete	30	Fair
Stc 7787;plymouth over Boise River & Canal	Canyon	1922		Steel	2,100	Poor
River Run Road over E.fk.jarbidge River	Owyhee	1922	2012	Steel	25	Fair
US 91 over Gibson Lateral Canal	Bingham	1923	1949	Steel	3,800	Poor
Strawberry Road over Weiser River	Adams	1923		Concrete	30	Fair
Old HWY 95 over Little Salmon River	Adams	1923		Steel	20	Poor
Mckenzie Creek Rd. over Slippy Creek	Idaho	1923		Concrete	40	Fair
SH 46 over Little Wood River	Gooding	1924		Concrete	8,100	Fair
US 91 over Tyhee Wasteway Canal	Bannock	1925	1949	Concrete	4,600	Fair
US 91 over Ross Fork Creek	Bingham	1925	1949	Concrete	3,800	Fair
Pines Road over Little Salmon River	Adams	1925		Steel	50	Fair
Forest Street over Orofino Creek	Clearwater	1925	1959	Steel	70	Fair
Fun Farm Road over Henrys Fk Snake River	Fremont	1925	1998	Steel	30	Poor
US 30 over Noble Canal	Payette	1926	1953	Concrete	4,100	Fair
US 93 over Salmon River;salmon Br.	Lemhi	1926	1964	Concrete	7,300	Poor
Parkinson Road over Cub River	Franklin	1926		Concrete	310	Poor
1775 South Road over Little Wood River	Gooding	1926		Concrete	800	Fair
Stc 6749; 3300w over Big Lost River	Butte	1926		Concrete	290	Fair
Stc 6749;2500n over Big Lost River	Butte	1926		Concrete	500	Fair
Stc 6749; 2900n over Big Lost River	Butte	1926		Concrete	260	Fair
Old Chilli Road over Thousand Springs Creek	Custer	1926		Concrete	80	Poor
Pollock Road over Little Salmon R;pollock	Idaho	1927		Steel	100	Fair
Stc3840; Sweet-ola over Squaw Creek	Gem	1928	1992	Prestressed Concrete	470	Fair
Stc 5803;moyie Rvr over Moyie River;meadow Creek	Boundary	1928	1983	Prestressed Concrete	120	Fair
990 South Road over T.f.northside Main Cnl	Jerome	1928		Concrete	620	Fair
Nhs8031;old Butte over E Lateral Canal	Bonneville	1928		Concrete	1,000	Fair
N 26th W over Great Western Canal	Bonneville	1928		Concrete	480	Fair
N 26th W over Osgood Canal	Bonneville	1928		Concrete	20	Fair
990 South Road over Milner Gooding Canal	Jerome	1929		Concrete	620	Fair
Cedar Road over Cottonwood Creek	Nez Perce	1929		Steel	20	Fair
River Road over Pine Creek	Nez Perce	1929	1968	Steel	30	Fair
Stc5751;old HWY 95 over Sirr & Uprr;s.athol Op	Kootenai	1929		Concrete	540	Poor
S3706;pleasant Vly over Jordon Creek;pleasant Br	Owyhee	1930	1982	Steel	50	Fair
Stc3892;indian Vly over Grays Creek	Adams	1930	1965	Prestressed Concrete	160	Fair
Presto Road over Sand Creek	Bingham	1930	1976	Prestressed Concrete	140	Fair
1550 East Road over Dry Creek	Gooding	1930	1959	Steel	30	Poor
2050 East Road over Little Wood River	Gooding	1930	1967	Steel	20	Poor
1750 South Road over T.f.northside Main Cnl	Gooding	1930	1973	Concrete	170	Fair
4th Ave. (1775 S.) over T.f.northside Main Cnl	Gooding	1930	1967	Concrete	170	Fair
2000 South Road over T.f.northside Main Cnl	Gooding	1930	1963	Steel	160	Fair
2500 East Road over Gooding Main Canal	Gooding	1930	1965	Steel	30	Fair
North Road over Dry Creek	Gooding	1930	1972	Steel	30	Fair
2400 East Road over Gooding Main Canal	Gooding	1930	1962	Steel	30	Fair
1375 South Road over Canal	Gooding	1930	1962	Concrete	30	Fair
1400 South Road over Dry Creek	Gooding	1930	1972	Steel	30	Fair
1600 East Road over Dry Creek	Gooding	1930	1973	Steel	30	Fair
2300 East Road over Big Wood River	Gooding	1930	2003	Steel	20	Fair
7th Avenue West over T.f.northside Main Cnl	Gooding	1930	1975	Concrete Continuous	1,300	Fair
2000 East Road over X Canal	Gooding	1930	1968	Steel Continuous	30	Fair
2300 East Road over Little Wood River	Gooding	1930	1991	Concrete	300	Fair
3400 North RD over High Line Canal	Twin Falls	1930	1974	Prestressed Concrete	40	Fair
1500 East Road over High Line Canal	Twin Falls	1930	1973	Concrete Continuous	20	Fair
2500 East Road over Low Line Canal	Twin Falls	1930	1973	Prestressed Concrete	140	Fair
1050 East Road over High Line Canal	Twin Falls	1930	1977	Prestressed Concrete	30	Fair
Sma 8683;black Cat over Five Mile Creek	Ada	1930	1967	Prestressed Concrete	6,100	Fair
Clay Lane over W.br.goose Cr;meadows Br	Adams	1930	1994	Steel	80	Fair
Zims RD over Little Salmon River	Adams	1930	1990	Steel	100	Fair
Goodrich Creek RD over Weiser River	Adams	1930	1987	Steel	140	Fair
Stc3883;clear Crk over Grimes Creek	Boise	1930	1995	Steel	310	Fair

Oldest bridges in the United States · Longest bridges in Idaho