US Bridges

Girder and Floorbeam System bridges in Montana

Main girders along the bridge with transverse floorbeams carrying the deck, typical of larger steel bridges. Montana has 79 of them, 1.5% of its bridges. Nationally this type accounts for 0.8% of all bridges.Compare states for this type.

Girder and Floorbeam System bridges
79
Poor condition
14%
11 bridges
Average age
63.2 yrs
Combined length
8 mi

Busiest girder and floorbeam system bridges in Montana

Top 79 by daily traffic
BridgeCountyLocationBuiltTypeLengthDaily trafficCondition
Madison St-Us 12 over Clark Fork River
No. P00007095+00581
Missoula CountyMissoula-Madison ST1958Girder and Floorbeam System552 ft18,393Fair
15th ST N-Us 87 over Missouri R-Rivers Trail
No. P00010003+05341
Cascade CountyGreat FALLS-15th ST N1962Girder and Floorbeam System1,126 ft14,369Fair
US 89-MT 3-MT 200 over Missouri RIVER-U5205-RR
No. P00060094+08282
Cascade CountyGreat FALLS-10th Ave S1951Girder and Floorbeam System2,092 ft13,666Fair
S Higgins Ave over Clark Fork R-Ped Paths
No. U08113000+02381
Missoula CountyMissoula-S Higgins Ave1962Girder and Floorbeam System974 ft11,197Fair
I 90 over Clark Fork River
No. I00090081+08401
Missoula County6.2M E Alberton1964Girder and Floorbeam System982 ft9,168Poor
S 200S-TOWNE ST over Yellowstone River
No. P00057327+03371
Dawson CountyGlendive-Towne ST1958Girder and Floorbeam System1,323 ft8,821Fair
S 82 over Flathead River
No. P00082005+05831
Flathead County3M NW Big Fork1955Girder and Floorbeam System686 ft8,310Poor
I 90 over Yellowstone River
No. I00090333+05521
Park CountyLivingston1962Girder and Floorbeam System730 ft6,397Fair
I 90 over Yellowstone River
No. I00090333+05522
Park CountyLivingston1962Girder and Floorbeam System730 ft6,397Fair
California Ave over Kootenai River
No. P00033000+07121
Lincoln CountyLibby-California Ave1959Girder and Floorbeam System698 ft5,674Fair
I 90 over Yellowstone River
No. I00090398+00811
Stillwater County5.6M E Reedpoint1961Girder and Floorbeam System558 ft5,423Fair
S 78 over Yellowstone River
No. P00078046+01371
Stillwater CountyColumbus1957Girder and Floorbeam System576 ft5,017Poor
I 90 over Int Cyr-Clark Fork Rvr
No. I00090070+00902
Mineral County5M W Alberton1965Girder and Floorbeam System762 ft4,585Fair
I 90 over Clark Fork River
No. I00090066+02792
Mineral County9.3M W Alberton1965Girder and Floorbeam System807 ft4,088Poor
Old HWY 312 over Yellowstone River 170
No. L56788012+07001
Yellowstone CountyHuntley1949Girder and Floorbeam System1,022 ft4,005Poor
I 90 over Clark Fork River
No. I00090049+03971
Mineral County1.9M E Superior1966Girder and Floorbeam System801 ft3,825Fair
I 90 over Clark Fork River
No. I00090049+03972
Mineral County1.9M E Superior1960Girder and Floorbeam System801 ft3,825Fair
I 90 over Clark Fork River
No. I00090053+07231
Mineral County6.2M E Superior1967Girder and Floorbeam System757 ft3,825Fair
I 90 over Clark Fork River
No. I00090053+07232
Mineral County6.2M E Superior1967Girder and Floorbeam System757 ft3,825Fair
I 90 over Clark Fork River
No. I00090058+05501
Mineral County10.5M E Superior1967Girder and Floorbeam System826 ft3,825Fair
I 90 over Clark Fork River
No. I00090058+05502
Mineral County10.5M E Superior1967Girder and Floorbeam System826 ft3,825Fair
I 90 over Clark Fork River
No. I00090045+01802
Mineral County2.5M W Superior1960Girder and Floorbeam System621 ft3,719Fair
I 94 over Yellowstone River
No. I00094214+08321
Dawson CountyN Glendive1968Girder and Floorbeam System1,974 ft2,981Fair
S 59 over Yellowstone River
No. P00018001+00921
Custer CountyMiles City1957Girder and Floorbeam System976 ft2,949Fair
I 94 over Bighorn River
No. I00094052+01481
Yellowstone County0.6M W Bighorn1963Girder and Floorbeam System580 ft2,613Fair
S 200 over Clark Fork River
No. P00006049+03411
Sanders County1M W Thompson Falls1960Girder and Floorbeam System952 ft2,482Poor
I 15 over Rr-Missouri River
No. I00015246+04051
Cascade County8M S Cascade1968Girder and Floorbeam System739 ft2,201Fair
I 15 over Rr-Missouri River
No. I00015246+04052
Cascade County8M S Cascade1968Girder and Floorbeam System740 ft2,201Fair
I 15 over Sep Missouri Rvr-Co RD
No. I00015236+02121
Lewis and Clark County2M N Craig1967Girder and Floorbeam System771 ft2,201Fair
I 15 over Sep Missouri Rvr-Co RD
No. I00015236+02122
Lewis and Clark County2M N Craig1967Girder and Floorbeam System771 ft2,201Fair
I 94 over Yellowstone River
No. I00094214+08322
Dawson CountyN Glendive1968Girder and Floorbeam System2,014 ft2,109Fair
S 200 over Clark Fork River
No. P00006028+01091
Sanders County1M NW Trout Creek1958Girder and Floorbeam System1,061 ft2,069Fair
US 191 over Yellowstone River
No. P00045000+09831
Sweet Grass County1M N Big Timber1938Girder and Floorbeam System380 ft1,699Fair
US 93 FH 19 over E Fork Bitterroot River
No. P00007018+00921
Ravalli County5M SE Conner1937Girder and Floorbeam System130 ft1,099Fair
Petty Creek RD over Clark Fork 008
No. L32090000+01001
Missoula County2M E Alberton1964Girder and Floorbeam System457 ft948Fair
S 80-13th ST over Missouri River
No. P00080002+04331
Chouteau CountyFort BENTON-13th ST1962Girder and Floorbeam System708 ft930Poor
IRR - S 313 over Bighorn River
No. S00313008+03271
Big Horn County7M SW Hardin1958Girder and Floorbeam System576 ft899Fair
US 12 over Yellowstone River
No. P00014270+03311
Rosebud CountyW Edge Forsyth1958Girder and Floorbeam System830 ft722Fair
S 37 FH 57 over Kootenai River
No. P00033013+07941
Lincoln County3M S Libby Dam1969Girder and Floorbeam System1,237 ft661Fair
US 191 over Missouri River
No. P00061088+00671
Fergus County29M NE Roy1959Girder and Floorbeam System698 ft655Poor
Upper Rock CR RD over Stony Creek 011
No. L20002013+00001
Granite County19M W Phillipsburg1999Girder and Floorbeam System50 ft603Fair
Route 284 over Canyon Ferry Spillway
No. MTA-CF-001
Lewis and Clark County14 MI E-Ne of Helena Mt1950Girder and Floorbeam System230 ft600Fair
Blankenship RD over Flathead River 070
No. L15427002+03001
Flathead County4M NW Coram1960Girder and Floorbeam System390 ft548Fair
US 287 over Sun River
No. P00009043+01451
Lewis and Clark County4M NE Augusta1936Girder and Floorbeam System320 ft538Fair
Marias Valley RD over Marias River 001
No. L51306003+02001
Toole County5M S Shelby1936Girder and Floorbeam System545 ft511Fair
S 117 over Milk River
No. P00017011+00781
Valley County1M S Nashua1957Girder and Floorbeam System370 ft479Fair
S 253 over Yellowstone River
No. S00253001+03031
Prairie County1M NE Terry1959Girder and Floorbeam System896 ft441Fair
Tampico RD over Milk River
No. S00246002+01001
Valley County2M W Glasgow1960Girder and Floorbeam System405 ft392Fair
E Fork RD over E Fork Bitterroot R 009
No. L41601014+01001
Ravalli County14M NE Sula1947Girder and Floorbeam System84 ft309Fair
Central Ave E over Missouri River
No. S00330036+06001
Cascade CountyCascade1954Girder and Floorbeam System653 ft289Fair
Musselshell Trl RD over Yellowstone River
No. S00310000+08501
Yellowstone County1M N Custer1964Girder and Floorbeam System567 ft265Fair
S 446 over Yellowstone River
No. S00446001+02661
Rosebud County1M W Rosebud1970Girder and Floorbeam System683 ft257Fair
Chief Mountain Int over Lee Creek
No. 1430032P0000000
Glacier County12.7 Miles North of Saint1935Girder and Floorbeam System210 ft246Fair
Lowrey RD over Sun River 062
No. L07001000+06001
Cascade County5M NW Simms1960Girder and Floorbeam System200 ft100Fair
Ewing RD over Belt Creek 074
No. L07222000+03001
Cascade County3M N Belt1973Girder and Floorbeam System142 ft100Fair
County Road 542 over Thirteen Mile CR 061
No. L11417003+03001
Dawson County5M NW Intake1964Girder and Floorbeam System60 ft100Poor
Homestead DR over Pinkham Creek 140
No. L27067000+04001
Lincoln County9M SW Eureka1914Girder and Floorbeam System65 ft100Poor
Tobacco Siding RD over Tobacco River 146
No. L27077000+04001
Lincoln County6M SE Eureka1950Girder and Floorbeam System45 ft100Fair
Packer Creek RD over ST Regis River 007
No. L31110000+01001
Mineral CountySaltese1957Girder and Floorbeam System62 ft100Fair
Elk Flats RD over Elk Creek 115
No. L32662002+00001
Missoula CountyW of Condon1996Girder and Floorbeam System61 ft100Fair
Stoltz RD over Birch Creek 001
No. L37038002+03001
Pondera County12M W Valier1976Girder and Floorbeam System42 ft100Fair
Dry Gulch RD over N Fork Blackfoot R 007
No. L39411002+01001
Powell County5M E Ovando1968Girder and Floorbeam System97 ft100Fair
Michel Creek RD over Camas Creek 002
No. L45210000+02001
Sanders County6M N Perma1978Girder and Floorbeam System38 ft100Poor
N Bench RD over West Fork Poplar R 026
No. L53336002+00001
Valley County9M NE Opheim1975Girder and Floorbeam System158 ft100Fair
Myers RD over Yellowstone River
No. S00311010+00011
Treasure CountyMyers1968Girder and Floorbeam System706 ft96Fair
IRR - SR 480 over Missouri River
No. S00480003+00001
Richland County9M SW Brockton1968Girder and Floorbeam System1,057 ft80Fair
Forest Road over Wheeler Creek
No. 011006000000023
Flathead CountyWest Side Reservoir1952Girder and Floorbeam System62 ft65Fair
F Bridge RD over Marias River
No. S00417007+01001
Toole County12M SE Shelby1953Girder and Floorbeam System455 ft55Fair
No Data Entered over Beaver Creek
No. 011202000020830
Lewis and Clark CountyNo Data Entered2019Girder and Floorbeam System45 ft50Good
No Data Entered over Beaver Creek
No. 011202000020831
Lewis and Clark CountyNo Data Entered2018Girder and Floorbeam System39 ft50Good
300-1 over ST Regis River
No. 011607000001052
Mineral CountyST Regis River1955Girder and Floorbeam System125 ft50Fair
No Data Entered over ST Regis River
No. 011607000017192
Mineral CountyNo Data Entered1900Girder and Floorbeam System81 ft50Fair
W K Gold CR RD over West Fork Gold Creek
No. 011603000000207
Missoula CountyNo Data Entered1997Girder and Floorbeam System40 ft50Fair
RD 56 over W F Thompson Riv
No. 011605000000009
Sanders CountyThompson River1935Girder and Floorbeam System78 ft50Fair
1-LANE Road over W.Fork Stillwater River
No. 010802000001001
Sweet Grass CountyNo Data Entered1964Girder and Floorbeam System40 ft50Fair
RD 895 over Sullivan Creek
No. 011004000000024
Flathead CountySullivan CR1952Girder and Floorbeam System123 ft40Fair
1127: Dry Fork over Beauchamp Creek
No. 000000000L59208
Phillips County13 MI SE of US 1911972Girder and Floorbeam System62 ft25Fair
1127: Dry Fork over Dry Fork Creek
No. 000000000L59209
Phillips County19 MI SE of US 1911979Girder and Floorbeam System30 ft25Good
2864: Braziel Cr. over Nevada Creek
No. 000000000L59191
Powell County0.2 MI S of MT1411977Girder and Floorbeam System67 ft25Fair

Counties with the most

Mineral County12
Cascade County7
Missoula County6
Lewis and Clark County6
Dawson County4
Flathead County4
Lincoln County4
Sanders County4
Valley County3
Yellowstone County3
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