Bridges in Idaho

4,643Total Bridges

1,465Good

2,928Fair

250Poor

Bridge Conditions in Idaho

Idaho has 4,643 bridges tracked in the National Bridge Inventory. Of these, 250 (5%) are rated as poor condition — meaning at least one major component has significant deterioration. The average bridge in Idaho is 46 years old.

Idaho Bridge Facts

Total Bridges	4,643
Good Condition	1,465
Fair Condition	2,928
Poor Condition	250
Average Bridge Age	46 years
Longest Bridge	5899.0 ft

Longest Bridges in Idaho

US 95 over Pend Oreille R;sandpoint5899.0 ftFair I 90 over I 90b;canyon CR4478.0 ftFair Sma7344;bryden Cyn over Snake R;high/southway Br1866.1 ftFair I 90 over Bennett Bay;sunnyside RD1730.0 ftFair SH 16 over Boise River1726.0 ftGood

Counties in Idaho

Ada302 bridges3 poor Adams87 bridges8 poor Bannock128 bridges6 poor Bear Lake34 bridges Benewah48 bridges3 poor Bingham263 bridges9 poor Blaine95 bridges4 poor Boise89 bridges5 poor Bonner104 bridges11 poor Bonneville213 bridges3 poor Boundary83 bridges11 poor Butte32 bridges1 poor Camas62 bridges7 poor Canyon291 bridges6 poor Caribou45 bridges2 poor Cassia117 bridges Clark39 bridges5 poor Clearwater88 bridges6 poor Custer126 bridges14 poor Elmore98 bridges8 poor Franklin23 bridges2 poor Fremont138 bridges8 poor Gem57 bridges3 poor Gooding80 bridges5 poor Idaho216 bridges15 poor Jefferson125 bridges4 poor Jerome111 bridges10 poor Kootenai159 bridges7 poor Latah119 bridges1 poor Lemhi113 bridges9 poor Lewis21 bridges1 poor Lincoln53 bridges14 poor Madison80 bridges Minidoka67 bridges1 poor Nez Perce72 bridges3 poor Oneida23 bridges Owyhee49 bridges4 poor Payette65 bridges3 poor Power71 bridges1 poor Shoshone261 bridges26 poor Teton37 bridges2 poor Twin Falls126 bridges5 poor Valley153 bridges10 poor Washington80 bridges4 poor

Poor Condition Bridges in Idaho

Bridge	County	Length	Traffic	Year
I 90 Wbl over Pedestrian/bike Path	Kootenai	129.9 ft	31,250	1971
S 25 E; S Hitt RD over Sand Creek	Bonneville	43.0 ft	27,500	1994
Nhs 7773;10th AVE over City St;uprr;caldwell Op	Canyon	621.1 ft	19,500	1956
Stp7046;lincoln RD over Idaho Canal	Bonneville	75.1 ft	18,000	1984
I 15 Sbl over I15b;uprr;s.blackfoot Ic	Bingham	392.1 ft	13,750	1961
I 15 Nbl over I15b;uprr;s.blackfoot Ic	Bingham	392.1 ft	13,750	1961
Stc7232;blue Lakes over Rock Creek	Twin Falls	39.0 ft	11,500	1959
I 15 Nbl over Main Street Gs	Bannock	124.0 ft	7,750	1962
I 15 Sbl over Main Street Gs	Bannock	124.0 ft	7,750	1962
I 15 Nbl over I 15b;w.inkom Ic	Bannock	113.8 ft	7,750	1962
US 93 over Salmon River;salmon Br.	Lemhi	438.0 ft	7,300	1926
I 15b ;us 91 over Blackfoot River	Bingham	106.0 ft	7,000	1936
Sma 7643;healy RD over New York Canal	Ada	113.8 ft	7,000	1964
Sma 7611;w. Bridge over Snake River	Bingham	482.9 ft	6,900	1936
Sma 7643;eckert RD over Ridenbaugh Canal	Ada	70.9 ft	6,700	1954
Sma 7643;eckert RD over Boise River(barber Br)	Ada	315.0 ft	6,700	1954
Sma 7674;mtn View over Paradise Creek	Latah	28.9 ft	6,400	1992
Stc2714;3700 North over Rock Creek	Twin Falls	21.0 ft	6,000	1973
SH 33 over Spring Creek	Teton	43.0 ft	5,600	1975
Blaine ST over Old Indian Creek Channel	Canyon	39.0 ft	5,400	1966
SH 52 over Snake River;payette Br.	Payette	689.0 ft	5,100	1953
US 91 over Blackfoot Canal	Bingham	43.0 ft	4,600	1951
SH 55 over Uprr;n.fk.payette River	Valley	411.1 ft	4,100	1933
US 91 over Gibson Lateral Canal	Bingham	27.9 ft	3,800	1923
Bunco Road over Bunco Rd; US 95 Ic	Kootenai	274.9 ft	3,800	2012
US 2 over Priest River	Bonner	352.0 ft	3,100	1962
US 30 over Dry Creek	Twin Falls	60.0 ft	2,900	1934
Stc7151;benton ST over Portneuf River	Bannock	46.9 ft	2,800	1969
US 30 over Uprr;bickel Overpass	Twin Falls	158.1 ft	2,500	1936
I 90b over S.fk.cda R;i-90b Arch	Shoshone	94.2 ft	2,300	1940
Stc 7787;plymouth over Boise River & Canal	Canyon	388.1 ft	2,100	1922
N 45th E over Sand Creek	Bonneville	70.9 ft	2,100	1957
Sma 7733;kimball A over Indian Creek	Canyon	39.0 ft	2,000	1933
Bunker AVE over S.fk.coeur Dalene River	Shoshone	168.0 ft	1,900	1971
I 15 Sbl over Co.rd.;stoddard Creek Ic	Clark	107.0 ft	1,750	1969
Stc2866;baseline R over Snake R.(montgomery Br)	Minidoka	960.0 ft	1,500	1954
Sma 8803;6th AVE over Payette River	Payette	403.9 ft	1,400	1959
Airport Road over I 86 Eb-wb;airport Ic	Power	312.0 ft	1,300	1968
Stc 1757;main ST over Portneuf River	Bannock	43.0 ft	1,200	1962
Old River Road over Stc 5752;n.fk.cda River	Shoshone	264.1 ft	1,200	1930
Stc 6774;teton HWY over S.fk.teton River	Fremont	149.9 ft	1,100	1977
Weston-fairview RD over Bear River;e.weston Br.	Franklin	174.9 ft	1,000	1956
SH 13b over M.f.clwater R.;e.kooskia	Idaho	481.0 ft	980	1935
Stc5752;cda Rvr RD over Coeur Dalene River	Shoshone	344.2 ft	960	1951
Cascade Road over Enterprise Canal	Gem	25.9 ft	950	1950
S5907;deep Crk Lp over Bnrr;uprr & Deep Creek	Boundary	502.0 ft	900	1936
S5786;colburn Culv over Grouse Creek	Bonner	65.0 ft	870	1941
Colburn Culver RD over Pack River	Bonner	96.1 ft	870	1941
Stc 8317;duff Lane over Willow Creek	Canyon	27.9 ft	750	1983
SH 75 over Yankee Fk Of Salmon Rivr	Custer	200.1 ft	680	1934
Stc 1699;canyon RD over Coeur Dalene River	Kootenai	328.1 ft	680	1936
Stc2744;1900 E. RD over C Canal	Jerome	25.9 ft	660	1965
SH 46 over Minear Creek	Camas	29.9 ft	630	1955
620 North Road over Milner Gooding Canal	Lincoln	49.9 ft	560	1965
Stc 3851;hexon RD over Boise River	Canyon	331.0 ft	560	1954
Stc4705;doumecq RD over Salmon R;whitebird Truss	Idaho	585.0 ft	550	1935
Stc5751;old HWY 95 over Sirr & Uprr;s.athol Op	Kootenai	181.1 ft	540	1929
N 4400 E (shelton) over Burgess Canal	Jefferson	44.9 ft	510	1969
Adams Boulevard over Adams Drainage	Butte	39.0 ft	491	1993
S3944;farm To Mrkt over Willow Creek	Valley	24.0 ft	490	1996
Stc 8217;cove Road over Weiser River	Washington	249.0 ft	490	1917
SH 3 over ST Maries River	Shoshone	105.0 ft	460	1955
Ridgeway Road over C Canal	Jerome	32.2 ft	450	1963
E Shore Road over Hunt Creek	Bonner	24.0 ft	430	1975
Lenore Grade Road over Clearwater R;lenore Br.	Nez Perce	525.9 ft	400	1935
Stc 3988;roseberry over Willow Creek	Valley	29.9 ft	370	1996
Stc 5711;moon Pass over Big Dick Creek	Shoshone	238.8 ft	370	1909
Stc2781;1300 S. RD over Thorn Creek	Gooding	71.9 ft	360	1955
Third Street over S.fk.coeur Dalene River	Shoshone	32.2 ft	360	1978
IRR BIA RTE 11 over Little Hangman Creek	Benewah	53.1 ft	350	1977
Salmon River Road over Pine Creek	Lemhi	40.4 ft	350	2012
Stc2768;2400 E. RD over Milner Gooding Canal	Jerome	76.1 ft	330	1970
Squaw Creek Road over Squaw Creek	Custer	24.0 ft	330	1960
Squaw Creek RD over Squaw Creek	Custer	24.0 ft	330	1960
Parkinson Road over Cub River	Franklin	50.9 ft	310	1926
200 East Road over T.f.northside Main Cnl	Jerome	37.1 ft	310	1970
Hunt Road over T.f.northside Main Cnl	Jerome	66.9 ft	310	1960
N. St. Charles over Lemhi River	Lemhi	79.1 ft	310	1948
Stc 5804;westside over Myrtle Creek	Boundary	51.8 ft	300	1958
Squaw Creek RD over Squaw Creek	Custer	24.9 ft	300	1960
Stc 1840:wolverine over Idaho Canal	Bingham	41.0 ft	290	2002
Rapid Lightning RD over Rapid Lightning Creek	Bonner	41.0 ft	280	1970
Paddy Flat Road over Boulder Creek	Valley	29.9 ft	230	1978
Cooper Pass Road over Canyon Creek	Shoshone	38.1 ft	220	2012
1100 South Road over C Canal	Jerome	27.9 ft	200	1975
North Apple Street over Little Wood River	Lincoln	44.9 ft	200	1920
North Birch Street over Little Wood River	Lincoln	63.0 ft	200	1913
Stc2784;millard RD over Milner Gooding Canal	Lincoln	78.1 ft	200	1955
Rock Creek Road over Red Rock Creek	Idaho	30.8 ft	200	1970
Stc 6760;red Road over Camas Creek	Clark	44.9 ft	200	1953
No Data Entered over Boulder Creek	Lemhi	30.5 ft	200	1966
No Data Entered over Panther Creek	Lemhi	94.8 ft	200	1980
Scott Rd; W 100 S over Aberdeen Springfield Cnl	Bingham	91.9 ft	190	1964
Shoestring Road over Snake River;sw Bliss Br	Twin Falls	190.0 ft	190	1977
Stc 3007;unity RD over Weiser River	Washington	303.1 ft	180	1910
Mcintyre Street over Lapwai Creek	Nez Perce	61.0 ft	180	1935
Morrow Reservior R over Little Canyon Creek	Elmore	24.0 ft	170	1995
Morrow Reservoir R over Little Canyon Creek	Elmore	50.9 ft	170	1970
Willie RD over I 15;willie Road Gs	Bingham	211.9 ft	160	1959
Charlie Creek RD over Santa Creek	Benewah	24.6 ft	150	1964