Oldest Bridges in Idaho

The oldest bridge in Idaho dates to 1908. The table below shows the state's most historic bridges, ranked by year built. Many of these structures have survived well beyond their original design life — click any bridge to see its current condition and inspection history.

How this ranking works

This state list uses the NBI year-built field and links each bridge to its current inspection record. Treat age as a history signal, not a condition score.

Bridge	County	Year Built	Condition	Daily Traffic
Wildhorse Road over Wildhorse River	Adams	1908	Poor	30
Railroad Grade RD over St. Joe River	Benewah	1908	Fair	40
Sperry Grade RD over Potlatch Rvr(sperry Br)	Nez Perce	1908	Fair	170
Stc 5711;moon Pass over Big Dick Creek	Shoshone	1909	Poor	370
Stc 5711;moon Pass over Squaw Creek	Shoshone	1909	Fair	370
Stc 3007;unity RD over Weiser River	Washington	1910	Poor	180
Railroad Grade RD over Jacot Creek	Benewah	1912	Fair	40
Railroad Grade RD over Mercury Creek	Benewah	1912	Fair	40
Railroad Grade RD over Bond Creek	Benewah	1912	Fair	40
Potlatch Road over Elk Creek Trestle	Shoshone	1912	Poor	100
Potlatch Road over Big Creek Trestle	Shoshone	1912	Poor	100
Potlatch Road over Agatha Creek Trestle	Shoshone	1912	Poor	100
Potlatch Road over Black Prince Trestle	Shoshone	1912	Poor	100
Old Mil. Rr Grade over Slough Bridge	Shoshone	1912	Poor	15
Old Mil. Rr Grade over Trout Creek	Shoshone	1912	Poor	15
North Birch Street over Little Wood River	Lincoln	1913	Poor	200
Lake Way over North Fork Payette River	Valley	1913	Fair	100
Shafer Creek Road over Shafer Creek	Boise	1914	Poor	20
1200 South Road over Clover Creek	Gooding	1915	Fair	50
College Street over Paradise Creek	Latah	1915	Fair	2,600
1400 East Road over High Line Canal	Twin Falls	1915	Fair	20
Airport Road over Bear River	Bear Lake	1916	Fair	50
Stc 7664;w. 6th ST over Paradise Creek	Latah	1916	Fair	7,500
Access Rd; Park RD over Lawyers Creek;park Br	Lewis	1917	Poor	50
Stc 8217;cove Road over Weiser River	Washington	1917	Poor	490
Power Line Road over New York Canal	Canyon	1919	Fair	660
Elk Creek Road over Moon Gulch;ne.kellogg Br	Shoshone	1919	Fair	50
100 West ST over St. Charles CR N. Bridge	Bear Lake	1920	Fair	50
Timberline Road over E. Fk. Wood River	Blaine	1920	Fair	40
Brownlee Road over Payette River;gardena Br	Boise	1920	Fair	350
2800 N over E.branch Big Lost River	Butte	1920	Fair	40
2900n over E.branch Big Lost River	Butte	1920	Fair	260
200 South Road over Camas Creek	Camas	1920	Poor	30
Old Highway 95 over Slate Creek	Idaho	1920	Fair	50
Maple Street over Long Hollow Creek	Lewis	1920	Fair	70
North Apple Street over Little Wood River	Lincoln	1920	Poor	200
Highline Arrow RD over Potlatch R(arrow Jct Br)	Nez Perce	1920	Poor	90
Lulu Street over Big Canyon Creek	Nez Perce	1920	Fair	50
Stc2739;3800 E. RD over Lateral 10	Twin Falls	1920	Fair	2,900
Abstein Lane over E.fk. Of S.fk.salmon Rvr	Valley	1920	Fair	30
River Road over Salmon Falls Creek	Twin Falls	1921	Fair	30
Strawberry Road over Beaver Creek	Adams	1922	Fair	30
Stc 7787;plymouth over Boise River & Canal	Canyon	1922	Poor	2,100
River Run Road over E.fk.jarbidge River	Owyhee	1922	Fair	25
Strawberry Road over Weiser River	Adams	1923	Fair	30
Old HWY 95 over Little Salmon River	Adams	1923	Poor	20
US 91 over Gibson Lateral Canal	Bingham	1923	Poor	3,800
Mckenzie Creek Rd. over Slippy Creek	Idaho	1923	Fair	40
SH 46 over Little Wood River	Gooding	1924	Fair	8,100
Pines Road over Little Salmon River	Adams	1925	Fair	50
US 91 over Tyhee Wasteway Canal	Bannock	1925	Fair	4,600
US 91 over Ross Fork Creek	Bingham	1925	Fair	3,800
Forest Street over Orofino Creek	Clearwater	1925	Fair	70
Fun Farm Road over Henrys Fk Snake River	Fremont	1925	Poor	30
Stc 6749; 3300w over Big Lost River	Butte	1926	Fair	290
Stc 6749;2500n over Big Lost River	Butte	1926	Fair	500
Stc 6749; 2900n over Big Lost River	Butte	1926	Fair	260
Old Chilli Road over Thousand Springs Creek	Custer	1926	Poor	80
Parkinson Road over Cub River	Franklin	1926	Poor	310
1775 South Road over Little Wood River	Gooding	1926	Fair	800
US 93 over Salmon River;salmon Br.	Lemhi	1926	Poor	7,300
US 30 over Noble Canal	Payette	1926	Fair	4,100
Pollock Road over Little Salmon R;pollock	Idaho	1927	Fair	100
Nhs8031;old Butte over E Lateral Canal	Bonneville	1928	Fair	1,000
N 26th W over Great Western Canal	Bonneville	1928	Fair	480
N 26th W over Osgood Canal	Bonneville	1928	Fair	20
Stc 5803;moyie Rvr over Moyie River;meadow Creek	Boundary	1928	Fair	120
Stc3840; Sweet-ola over Squaw Creek	Gem	1928	Fair	470
990 South Road over T.f.northside Main Cnl	Jerome	1928	Fair	620
990 South Road over Milner Gooding Canal	Jerome	1929	Fair	620
Stc5751;old HWY 95 over Sirr & Uprr;s.athol Op	Kootenai	1929	Poor	540
Cedar Road over Cottonwood Creek	Nez Perce	1929	Fair	20
River Road over Pine Creek	Nez Perce	1929	Fair	30
Sma 8683;black Cat over Five Mile Creek	Ada	1930	Fair	6,100
Stc3892;indian Vly over Grays Creek	Adams	1930	Fair	160
Clay Lane over W.br.goose Cr;meadows Br	Adams	1930	Fair	80
Zims RD over Little Salmon River	Adams	1930	Fair	100
Goodrich Creek RD over Weiser River	Adams	1930	Fair	140
Presto Road over Sand Creek	Bingham	1930	Fair	140
Stc3883;clear Crk over Grimes Creek	Boise	1930	Fair	310
2150 N over Big Lost River	Butte	1930	Fair	30
Stc 7787;plymouth over Riverside Canal	Canyon	1930	Fair	2,100
Mule Shoe Mine RD over Salmon River;se.clayton	Custer	1930	Poor	60
Bayhorse Road over Salmon River;bayhorse CR	Custer	1930	Fair	170
W 2nd Street over Farmers Coop Canal	Gem	1930	Fair	200
1550 East Road over Dry Creek	Gooding	1930	Poor	30
2050 East Road over Little Wood River	Gooding	1930	Poor	20
1750 South Road over T.f.northside Main Cnl	Gooding	1930	Fair	170
4th Ave. (1775 S.) over T.f.northside Main Cnl	Gooding	1930	Fair	170
2000 South Road over T.f.northside Main Cnl	Gooding	1930	Fair	160
2500 East Road over Gooding Main Canal	Gooding	1930	Fair	30
North Road over Dry Creek	Gooding	1930	Fair	30
2400 East Road over Gooding Main Canal	Gooding	1930	Fair	30
1375 South Road over Canal	Gooding	1930	Fair	30
1400 South Road over Dry Creek	Gooding	1930	Fair	30
1600 East Road over Dry Creek	Gooding	1930	Fair	30
2300 East Road over Big Wood River	Gooding	1930	Fair	20
7th Avenue West over T.f.northside Main Cnl	Gooding	1930	Fair	1,300
2000 East Road over X Canal	Gooding	1930	Fair	30
2300 East Road over Little Wood River	Gooding	1930	Fair	300
Stc4803;old HWY 95 over Cow Creek	Latah	1930	Fair	130
Stc4803;old HWY 95 over Cow Creek	Latah	1930	Fair	130
Barracks Lane over Lemhi River	Lemhi	1930	Fair	60
Little Canyon Road over Big Canyon Creek	Nez Perce	1930	Fair	190
S3706;pleasant Vly over Jordon Creek;pleasant Br	Owyhee	1930	Fair	50
Beet Dump Road over Grand View Irrg.dist.cnl	Owyhee	1930	Fair	65
Sage Road over Succor Creek	Owyhee	1930	Poor	90
River Road over Vinson Wash	Owyhee	1930	Poor	60
Old River Road over Stc 5752;n.fk.cda River	Shoshone	1930	Poor	1,200
3400 North RD over High Line Canal	Twin Falls	1930	Fair	40
1500 East Road over High Line Canal	Twin Falls	1930	Fair	20
2500 East Road over Low Line Canal	Twin Falls	1930	Fair	140
1050 East Road over High Line Canal	Twin Falls	1930	Fair	30
Old HWY Road over Beaver Creek	Washington	1930	Fair	220
Big Flat Road over Tennison Creek	Washington	1930	Fair	50
Sand Road over Galloway Canal	Washington	1930	Fair	50
Nhs 7553;capitol over Boise River	Ada	1931	Fair	16,500
SH 75 over Bellevue Canal	Blaine	1931	Fair	7,000
High Bridge Road over Willow Creek (white Br)	Bonneville	1931	Fair	30
E. Riverdale RD over Bear River	Franklin	1931	Fair	70
N 2850 E Road over Butte Market Lake Canal	Jefferson	1931	Fair	30
US 93 over Carmen Creek	Lemhi	1931	Fair	2,100
US 93 over Tower Creek	Lemhi	1931	Fair	2,100
Stp 7343;fairview over Boise River	Ada	1932	Fair	5,500
Old Highway 93 over Richfield Canal	Blaine	1932	Poor	10
US 20 Frontage RD over N. Branch Fall River Cnl	Fremont	1932	Poor	10
US 20 Frontage RD over Fall River Overflow	Fremont	1932	Poor	10
Old Highway 26 over S.gooding Main Canal	Lincoln	1932	Fair	800
Morscheck Road over Cow Creek;lagoon Br	Nez Perce	1932	Fair	30
Stc2715;4100 N. RD over Cedar Draw	Twin Falls	1932	Fair	2,700
Sma 7733;kimball A over Indian Creek	Canyon	1933	Poor	2,000
2400 East Road over Gooding Main Canal	Gooding	1933	Fair	20
SH 25 over L Canal	Jerome	1933	Fair	1,200
SH 55 over Uprr;n.fk.payette River	Valley	1933	Poor	4,100
SH 55 over Round Valley Creek	Valley	1933	Fair	4,100
SH 55 over Clear Creek	Valley	1933	Good	4,100
SH 55 over Big Creek	Valley	1933	Fair	4,100
Pine CR Bench Road over Pine Creek	Bonneville	1934	Fair	30
Old HWY 91 over Pleasant Valley Creek	Clark	1934	Fair	50
SH 75 over Yankee Fk Of Salmon Rivr	Custer	1934	Poor	680
Old Santiam Road over S.fk. Clearwater River	Idaho	1934	Fair	10
Forest Road 443 over Selway River	Idaho	1934	Poor	50
Forest Road 223 over Gedney CR	Idaho	1934	Fair	50
Forest Road 290 over Meadow Creek	Idaho	1934	Fair	50
Co. Rd.;old US 93 over M Canal	Jerome	1934	Fair	5
Co. Rd.;old US 93 over U Canal	Jerome	1934	Poor	5
Co. Rd.;old US 93 over R Canal	Jerome	1934	Fair	5
E Frontage Road over Wolf Lodge Creek	Kootenai	1934	Poor	150
Fs Route 225 over ST Joe River	Shoshone	1934	Poor	50
US 30 over Dry Creek	Twin Falls	1934	Poor	2,900
Elk Summit RD over South Fork Salmon River	Valley	1934	Poor	10
Butte Round over Low Line Canal	Bingham	1935	Fair	100
Grimes Creek Road over Grimes Creek	Boise	1935	Fair	20
Cemetary Road over Anderson Canal	Bonneville	1935	Fair	50
3175 North over Big Lost River	Butte	1935	Fair	210
Penny Lane over Golden Gate Canal	Canyon	1935	Fair	20
Stc 7863;s.5th AVE over Indian Creek	Canyon	1935	Fair	3,100
S. 12th Avenue over Indian Creek	Canyon	1935	Fair	560
Robinson Creek RD over Robinson Creek	Fremont	1935	Fair	30
SH 13b over M.f.clwater R.;e.kooskia	Idaho	1935	Poor	980
Stc4705;doumecq RD over Salmon R;whitebird Truss	Idaho	1935	Poor	550
Mcdonald Road over Shebang Creek	Idaho	1935	Fair	20
No Data Entered over Selway River	Idaho	1935	Good	10
S. Tamarack ST over Cow Creek	Latah	1935	Fair	50
Jenkins Road over Cow Creek	Latah	1935	Fair	30
Sprenger Road over Thorn Creek	Latah	1935	Fair	30
Mcintyre Street over Lapwai Creek	Nez Perce	1935	Poor	180
Lenore Grade Road over Clearwater R;lenore Br.	Nez Perce	1935	Poor	400
Frontage Road over Uprr; Igo Overpass	Power	1935	Fair	623
Siberts Old River over Fishhook Creek	Shoshone	1935	Fair	330
Old River Road over ST Joe River;avery Br	Shoshone	1935	Fair	330
Stc 5759;division over Little Pine Creek	Shoshone	1935	Fair	3,600
Fs Route No. 412 over Cda River	Shoshone	1935	Fair	50
Fs Route 1205 over ST Joe River	Shoshone	1935	Fair	50
Fs Route 303 over ST Joe River	Shoshone	1935	Fair	50
Fs Route No. 218 over Simmons Creek	Shoshone	1935	Fair	50
Fs Route No. 456a over N.f. ST Joe River	Shoshone	1935	Poor	50
Fs Route No. 300a over N.f. ST Joe River	Shoshone	1935	Fair	50
S6810;packsaddle R over Side Channel Teton River	Teton	1935	Fair	250
Stc2739;3800 E. RD over High Line Canal	Twin Falls	1935	Fair	1,000
Stc 3879;burton LN over Creek;slough	Washington	1935	Fair	140
I 15b ;us 91 over Blackfoot River	Bingham	1936	Poor	7,000
Sma 7611;w. Bridge over Snake River	Bingham	1936	Poor	6,900
SH 57 over Lower W.branch Priest R.	Bonner	1936	Fair	2,100
S5907;deep Crk Lp over Bnrr;uprr & Deep Creek	Boundary	1936	Poor	900
Old HWY 91 over Uprr;n.spencer Rr Op	Clark	1936	Poor	50
Mother Lode over American R;se.elk City B	Idaho	1936	Fair	50
No Data Entered over White Cap CR	Idaho	1936	Good	20
Forest Road 470 over Selway R Swiftwater	Idaho	1936	Fair	50
Stc 1699;canyon RD over Coeur Dalene River	Kootenai	1936	Poor	680
Stc 4811;lenville over Little Potlatch Creek	Latah	1936	Fair	110
Fs Route 2354 over Big Creek	Shoshone	1936	Fair	50
Fs Route 218 over Red Ives Creek	Shoshone	1936	Good	50
US 30 over Uprr;bickel Overpass	Twin Falls	1936	Poor	2,500
1500 East Road over Low Line Canal	Twin Falls	1936	Fair	80
3600 North Road over High Line Canal	Twin Falls	1936	Fair	70
SH 57 over Upper W.branch Priest R.	Bonner	1937	Fair	2,700
Fdr 105 over Nf Clearwater River	Clearwater	1937	Fair	20
N 2700 E over Crosscut Canal	Fremont	1937	Poor	10
E 600 N over Crosscut Canal	Fremont	1937	Fair	20