Oldest Bridges in Montana

The oldest bridge in Montana dates to 1881. 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
S Howie ST over Reeders Alley 001	Lewis and Clark	1881	Fair	100
Old Town RD over Jefferson River 063	Gallatin	1894	Poor	100
Augusta RD over Dearborn River 011	Lewis and Clark	1896	Fair	31
Old Town RD over Jefferson River 004	Gallatin	1897	Poor	100
Williams Br RD over Jefferson River 046	Gallatin	1898	Fair	87
No Data Entered over ST Regis River	Mineral	1900	Fair	50
Vermilion Riv RD over Lyons Creek 032	Sanders	1900	Good	100
N Locate RD over Locate Creek 045	Custer	1901	Fair	23
Birdtail RD over Flat Creek 036	Lewis and Clark	1901	Poor	100
Sundance Bench RD over Madison River 046	Madison	1902	Fair	100
Chevallier DR over Little Prickly Pear 109	Lewis and Clark	1905	Fair	37
Tusler RD over Yellowstone River 094	Custer	1907	Fair	78
Sunset Hill RD over Blackfoot River 088	Missoula	1907	Poor	100
Milwaukee RD over Yellowstone River 030	Prairie	1907	Fair	37
County Road 335 over Usbr Main Canal 001	Richland	1907	Fair	100
Ryan Canyon RD over Beaverhead River 023	Beaverhead	1908	Poor	14
Truly Cutoff RD over Smith River 033	Cascade	1908	Fair	100
Poor Farm Loop over Big Spring Creek	Fergus	1908	Fair	100
Cottonwood Bench R over Cottonwood Creek 030	Park	1908	Fair	100
Trout Creek RD over Little Blackfoot R 018	Powell	1908	Fair	100
County Road 434 over Usbr Main Canal 092	Richland	1908	Fair	100
Ashbough Trail over Red Rock River 086	Beaverhead	1909	Fair	15
Nfsr 834 over Belt Creek	Cascade	1909	Fair	99
Nfsr 1049 over Belt Creek	Cascade	1909	Fair	99
County Road 323 over Snake Creek 048	Blaine	1911	Fair	100
Bridge ST over Swan River 110	Flathead	1911	Poor	1,503
Vine ST over Rattlesnake Creek 002	Missoula	1911	Good	2,157
Powderville RD over Spring Creek 019	Custer	1912	Fair	47
Mt Evans Way over Warm Springs Creek 016	Deer Lodge	1912	Poor	100
Roosevelt Parkway over Kootenai River 070	Lincoln	1912	Fair	100
Horse CR RD over Flathead Creek 020	Park	1912	Fair	100
Mcleod Main ST over West Boulder River 025	Sweet Grass	1912	Poor	100
Roe LN over Red Rock River 121	Beaverhead	1913	Poor	4
Leslie RD over Elbow Creek 036	Carbon	1913	Fair	100
Bridger Fromberg R over Bluewater Creek 001	Carbon	1913	Fair	175
25th ST N over Abandoned Railroad	Cascade	1914	Fair	4,262
Lovers Lane over Elk Creek 041	Lewis and Clark	1914	Poor	100
Homestead DR over Pinkham Creek 140	Lincoln	1914	Poor	100
Chokecherry LN over Little Blackfoot R 027	Powell	1914	Poor	19
Pumphouse RD over Big Hole River 009	Silver Bow	1914	Fair	100
Browns Bridge RD over Big Hole River 123	Beaverhead	1915	Poor	100
Bluewater RD over Bluewater Creek 038	Carbon	1915	Fair	100
Buffalo Trail over Musselshell River 003	Golden Valley	1915	Fair	100
Augusta-clemons RD over Elk Creek 029	Lewis and Clark	1915	Fair	100
Potter Creek RD over Potter Creek 005	Park	1915	Poor	100
County RD 244 over Beaver Creek 132	Phillips	1915	Poor	100
Camp Creek RD over Pumpkin Creek 021	Powder River	1915	Fair	100
Beaverton RD over Beaver Creek 104	Valley	1915	Fair	68
Pishkun Road over Sun River	Lewis and Clark	1916	Poor	40
S Frontage RD W over Clark Fork 053	Mineral	1916	Poor	174
Musselshell RD over Musselshell River 015	Musselshell	1916	Fair	34
Harvey RD over Musselshell River 018	Musselshell	1916	Poor	100
Old Darby RD over Bitterroot River 074	Ravalli	1917	Fair	289
Quast LN over Surprise Ditch 060	Ravalli	1918	Poor	537
Old Darby RD over Rock Creek 052	Ravalli	1918	Fair	100
Axtell Anceny RD over Gallatin River 084	Gallatin	1919	Poor	569
County Road 111 over Horse Prairie Creek 031	Beaverhead	1920	Fair	100
Brundage LN over Red Rock River 052	Beaverhead	1920	Poor	100
Middle RD over Battle Creek 056	Blaine	1920	Poor	100
HWY 287 Bypass over Missouri River 019	Broadwater	1920	Poor	178
Mill Coulee RD over Mill Coulee Canal 064	Cascade	1920	Fair	100
Road 261 over Irrigation Canal 041	Dawson	1920	Fair	21
Road 261 over Irrigation Canal 042	Dawson	1920	Poor	21
County Road 098 over Clark Fork River 020	Deer Lodge	1920	Poor	100
E Boulevard ST over Big Spring Creek	Fergus	1920	Fair	675
W Brassey ST over Big Spring Creek	Fergus	1920	Fair	2,412
Frontage Rd-s 205 over Camp Creek	Gallatin	1920	Fair	2,274
Fish Hatchery RD over Post Creek 075	Lake	1920	Fair	100
Indian Creek RD over Shields River 027	Park	1920	Fair	100
Alkali RD over Alkali Creek 001	Phillips	1920	Poor	100
Road 261 over Bad Route Creek 044	Dawson	1921	Fair	80
Frontage Rd-s 205 over Baker Creek	Gallatin	1921	Fair	2,274
S 540 - E River RD over Yellowstone River	Park	1921	Fair	1,160
US 87-e Main ST over Mill Ditch	Fergus	1922	Fair	8,747
Maiden Rock RD over Bridger Creek 107	Gallatin	1922	Poor	100
Noxon AVE E over Cabinet Gorge Resv 047	Sanders	1922	Poor	100
Miller Road over Fort Belknap Canal 057	Blaine	1923	Fair	100
Old US HWY 91 over Muddy Creek Slough 111	Cascade	1923	Fair	100
Old US HWY 91 over Little Muddy Creek 090	Cascade	1923	Poor	100
Buttelman RD over Willow Creek 061	Gallatin	1923	Fair	100
Shields River RD E over Shields River 023	Park	1923	Poor	100
Howie RD over Drainage 021	Sweet Grass	1923	Fair	164
Forest Road over Tunnel Creek	Flathead	1924	Fair	5
Dry CR School RD over E Gallatin River 032	Gallatin	1924	Fair	100
HWY 10 W over Ninemile Creek 035	Missoula	1924	Poor	141
Big Swamp CR RD / over Big Hole River 089	Beaverhead	1925	Poor	100
Going-to-the-sun R over Logan Creek	Flathead	1925	Fair	1,230
Birch RD over Ross Fork Creek 018	Judith Basin	1925	Poor	16
S 540-e River RD over Mill Creek	Park	1925	Fair	909
Stage RD over Wild Horse Creek 023	Phillips	1925	Poor	100
Sand Creek RD over Sand Creek 031	Rosebud	1925	Fair	100
Frontage RD over Sarpy Creek 003	Treasure	1925	Poor	28
S 56th ST W over Canyon Creek Ditch 075	Yellowstone	1925	Fair	2,295
Trail Creek RD over Powder River 061	Custer	1926	Fair	100
Going-to-the-sun R over Mcdonald Creek	Flathead	1926	Fair	1,230
Old US 87 over E Fork Pryor Creek 174	Yellowstone	1926	Fair	564
E Elk Park RD over Bison Creek 016	Jefferson	1927	Poor	100
Fdr #8983 over N Fk Sun River	Lewis and Clark	1927	Poor	99
Old US HWY 2 N over Curley Creek 005	Lincoln	1927	Good	100
Silver Spring RD over Ruby River 023	Madison	1927	Poor	133
Frntage Road 81020 over Cottonwood Creek 083	Custer	1928	Poor	507
Moon Creek RD over Cottonwood Creek 044	Custer	1928	Fair	82
Frontage Road 205 over Snell Creek 073	Custer	1928	Poor	100
Hamilton RD over E Gallatin River 076	Gallatin	1928	Fair	100
Cb Route RD over Br Main Canal 035	Prairie	1928	Poor	80
Frontage Road 020 over Reservation Creek 036	Rosebud	1928	Fair	25
Frontage Road 303 over Graveyard Creek 055	Rosebud	1928	Poor	128
Old HWY 10 E over Smith Creek 053	Rosebud	1928	Fair	638
Birdland Bay RD over Clark Fork River 001	Sanders	1928	Fair	100
Old US 10 over Big Ditch 010	Stillwater	1928	Fair	828
Old US 10 over Cove Ditch 011	Stillwater	1928	Fair	828
Old US 10 over Cove Ditch 012	Stillwater	1928	Fair	828
Old US 10 over Hensley Creek 014	Stillwater	1928	Fair	1,617
Old US 10 over Cove Ditch 015	Stillwater	1928	Fair	1,617
Old US 10 over Allen Creek 016	Stillwater	1928	Fair	1,617
Old US 10 over Valley Creek 019	Stillwater	1928	Fair	1,617
Old US 10 over Lower Deer Creek 006	Sweet Grass	1928	Fair	344
Old HWY 312 over Custer Coulee 171	Yellowstone	1928	Fair	2,775
Frntage Road 81020 over Miles Creek 037	Custer	1929	Poor	507
Frntage Road 81020 over Macks Creek 038	Custer	1929	Poor	507
Frontage Road 205 over Cottonwood Creek 072	Custer	1929	Poor	100
Jenni RD over Beaver Creek 030	Fergus	1929	Fair	100
Dry Creek RD over Dry Creek	Gallatin	1929	Fair	204
Two Medicine Road over Appistoki Creek	Glacier	1929	Fair	183
S Main AVE over Mission Creek 052	Lake	1929	Poor	2,233
S 210 over Mrl Spur (not In Use)	Missoula	1929	Fair	2,075
Anderson LN over Beaverhead River 071	Beaverhead	1930	Fair	54
Warman Loop over Bighorn Canal 018	Big Horn	1930	Fair	100
Ekegren RD over Thirty Mile Creek 127	Blaine	1930	Fair	100
8 Mile RD over Milk River 078	Blaine	1930	Fair	100
Volney Creek RD over Red Lodge Creek 042	Carbon	1930	Fair	100
Bishop Creek RD over Shonkin Creek 016	Chouteau	1930	Fair	100
S 59 over South Fork Sunday Creek	Custer	1930	Fair	1,474
County Road 526 over N Fk Burns Creek 062	Dawson	1930	Fair	100
S 1 Fh 17 over Warm Springs Creek	Deer Lodge	1930	Fair	2,082
Water Street over Big Spring Creek 059	Fergus	1930	Fair	100
2nd Avenue over Big Spring Creek 060	Fergus	1930	Fair	100
US 87 over Drainage	Fergus	1930	Fair	1,148
Capp Lane over Pipestone Creek	Jefferson	1930	Fair	100
3rd AVE W over Otter Creek 036	Judith Basin	1930	Fair	100
Jocko Canyon RD over Jocko River 013	Lake	1930	Good	100
Old US HWY 93 over Dayton Creek 105	Lake	1930	Fair	100
Second ST S-us 89 over Yellowstone River	Park	1930	Fair	4,964
Old Cat Creek RD over Box Elder Creek 008	Petroleum	1930	Poor	100
Green Acres RD over Dodson North Canal 005	Phillips	1930	Fair	100
Kid Curry RD over Exeter Creek 004	Phillips	1930	Fair	100
S Frontage RD 011 over Powell Creek 063	Powell	1930	Fair	916
S Frontage RD 011 over Dempsey Creek 059	Powell	1930	Poor	916
S Frontage RD 011 over Racetrack Creek 067	Powell	1930	Fair	916
Old HWY 10 W over Williams Coulee 007	Prairie	1930	Poor	507
Old HWY 10 W over Conn`s Coulee 021	Prairie	1930	Fair	507
Old HWY 10 W over Drainage 022	Prairie	1930	Fair	507
Bridge RD over Musselshell River 001	Rosebud	1930	Fair	100
Old HWY 10 over Sweeney Creek 064	Rosebud	1930	Poor	128
20th LN NE over Teton River 051	Teton	1930	Fair	100
Fox Farm RD over Hay Coulee 006	Valley	1930	Fair	100
Fox Farm RD over Lindeke Coulee 007	Valley	1930	Poor	100
Fox Farm RD over Drainage 009	Valley	1930	Fair	100
Old HWY 10 over Bighorn River 126	Yellowstone	1930	Fair	100
Red Rock Road over Big Sheep Creek 026	Beaverhead	1931	Fair	100
Red Rock RD over Limekiln Canyon 022	Beaverhead	1931	Poor	60
Old HWY 87 over Two Leggins Canal 0	Big Horn	1931	Poor	564
Powerline RD over Drainage 025	Cascade	1931	Fair	100
Old US 91 over Novak Creek 005	Cascade	1931	Fair	316
Old US 91 over Missouri River-rr 069	Cascade	1931	Poor	316
Old US 91 over Prewett Creek 070	Cascade	1931	Fair	316
Powderville RD over Mizpah Creek 020	Custer	1931	Fair	47
Frontage Road 146 over Clark Fork River 034	Deer Lodge	1931	Fair	100
Frontage Road 146 over Willow Creek 033	Deer Lodge	1931	Fair	100
Frontage Road 146 over Drainage 032	Deer Lodge	1931	Good	100
Frontage Road 146 over Drainage 025	Deer Lodge	1931	Fair	100
Frontage Road 011 over Lost Creek 037	Deer Lodge	1931	Fair	916
S 48 over Warm Springs Creek	Deer Lodge	1931	Fair	1,692
Old US 2 E over Abbot Creek 063	Flathead	1931	Fair	100
US 191 Fh 42 over Spanish Creek	Gallatin	1931	Fair	8,952
Frontage Rd-s 205 over Drainage	Gallatin	1931	Fair	1,162
Many Glacier Road over Apikuni Creek	Glacier	1931	Fair	452
Many Glacier Road over Windy Creek	Granite	1931	Fair	452
S 1 over Fred Burr Creek	Granite	1931	Fair	1,695
S 1 over Flint Creek	Granite	1931	Fair	1,144
Basin ST over Basin Creek 040	Jefferson	1931	Fair	100
Mt HWY 2 over Big Pipestone Creek 062	Jefferson	1931	Fair	608
Mt HWY 2 over Colbert Creek 063	Jefferson	1931	Fair	608
S 2 over Rader Creek	Jefferson	1931	Fair	686
Mullan RD E over Nemote Creek 006	Mineral	1931	Poor	100
Mullan Gulch RD over Rock Creek 013	Mineral	1931	Fair	150
Mullan Gulch RD over Twelvemile Creek 014	Mineral	1931	Fair	150
Old US HWY 2 over Dodson S. Cnl Splway 098	Phillips	1931	Fair	100
US HWY 91 N over Dry Fork Marias 080	Pondera	1931	Fair	511
US HWY 91 N over Pondera Canal 081	Pondera	1931	Fair	511
IRR - S 13 over Sprague Coulee	Roosevelt	1931	Poor	229
Old US 10 over Berry Creek 024	Stillwater	1931	Fair	100
Old US 10 over Coulee Creek 023	Stillwater	1931	Fair	100
Boulder RD over Boulder River 002	Sweet Grass	1931	Fair	157
Old US 10 over Bridger Creek 040	Sweet Grass	1931	Fair	344
Old HWY 2 over Beaver Creek 115	Valley	1931	Poor	100
Logan ST SE over Antelope Creek 019	Wheatland	1931	Fair	100
Lower River RD over Bluewater Creek 002	Carbon	1932	Fair	100
US 12 over Hay Creek	Fallon	1932	Fair	516
IRR BIA RTE 2 over Dawson Creek	Glacier	1932	Poor	100