Status: Open to traffic
Location: 45.487459,-110.216804
Carries CR 102 over Boulder River
Design: truss/pony/warren/alt-verticals
Design Details: Warren pony truss with alternating verticals
Total Length: 107.9 Feet
Span Length: 75.1 Feet
Overview: Pony truss bridge over Boulder River on CR 102
History: Built 1931; rehabilitated 1991
Built: 1931
Location: Sweet Grass County
View Bridge Information In Wayback Machine
394553
Boulder River Bridge
View from the northeast
Photo taken by David Jones in June 2017
394554
Boulder River Bridge
western pier
Photo taken by David Jones in June 2017
394555
Boulder River Bridge
Eastern approach
Photo taken by David Jones in June 2017
394556
Boulder River Bridge
Eastern portal
Photo taken by David Jones in June 2017
394557
Boulder River Bridge
View from the southeast
Photo taken by David Jones in June 2017
Status: Open to traffic
Location: 45.403929,-110.192174
Carries CR 102 over Boulder River
Design: truss/pony/warren/alt-verticals
Design Details: Warren pony truss with alternating verticals
Total Length: 111.9 Feet
Span Length: 75.1 Feet
Overview: Pony truss bridge over Boulder River on CR 102
History: Built 1931; rehabilitated 1991
Built: 1931
Location: Sweet Grass County
View Bridge Information In Wayback Machine
394548
Boulder River Bridge
View from the southwest
Photo taken by David Jones in June 2017
394549
Boulder River Bridge
North railing
Photo taken by David Jones in June 2017
394550
Boulder River Bridge
Western pier
Photo taken by David Jones in June 2017
394551
Boulder River Bridge
Riveting
Photo taken by David Jones in June 2017
394552
Boulder River Bridge
Western portal
Photo taken by David Jones in June 2017
Status: Open to traffic
Location: 45.833333,-109.937778
Carries CR 103 over Boulder River
Design: truss/pony/warren
Design Details: Warren pony truss
Total Length: 146.0 Feet
Span Length: 105.0 Feet
Overview: Pony truss bridge over Boulder River on CR 103 in Big Timber
History: Built 1940
Built: 1940
Location: Sweet Grass County
View Bridge Information In Wayback Machine
358632
Boulder River Bridge - Big Timber
View from the east
Photo taken by David Jones in July 2016
358633
Boulder River Bridge - Big Timber
Photo taken by David Jones in July 2016
358634
Boulder River Bridge - Big Timber
East side
Photo taken by David Jones in July 2016
358635
Boulder River Bridge - Big Timber
Photo taken by David Jones in July 2016
358636
Boulder River Bridge - Big Timber
North Portal
Photo taken by David Jones in July 2016
Status: No longer exists
Location: 45.622500,-110.129167
Carries CR 116 over Boulder River
Design: truss/pony
Design Details: Pony truss
Total Length: 95.1 Feet
Span Length: 92.9 Feet
Overview: Lost pony truss bridge over Boulder River on CR 116
History: Built ca. 1930; replaced 2002
Built: ca. 1930
Location: Sweet Grass County
View Bridge Information In Wayback Machine
Status: Replaced by a new bridge
Location: 46.061696,-109.854143
Carries Otter Creek Road over Sweetgrass Creek
Design: truss/through
Design Details: Through truss
Total Length: 92.9 Feet
Span Length: 89.9 Feet
Overview: Through truss bridge over Sweetgrass Creek on Otter Creek Road
History: Built 1910; Replaced 2009
Built: 1910
Location: Sweet Grass County
View Bridge Information In Wayback Machine
456725
Replaced Sweet Grass Creek Bridge
Photo taken by David Jones in September 2019
456726
Replaced Sweet Grass Creek Bridge
Photo taken by David Jones in September 2019
Status: Open to traffic
Location: 45.889422,-109.742709
Carries CR 014 over Sweetgrass Creek
Design: truss/pony/pratt
Design Details: Pin-connected, 5-panel Pratt pony truss
Total Length: 70.9 Feet
Span Length: 70.9 Feet
Overview: Pony truss bridge over Sweetgrass Creek on CR 014
History: Built 1910; rehabilitated 1964
Built: 1910
Location: Sweet Grass County
View Bridge Information In Wayback Machine
359039
Sweet Grass Creek Bridge
Southern Portal
Photo taken by David Jones in July 2016
359040
Sweet Grass Creek Bridge
View from the northwest
Photo taken by David Jones in July 2016
359041
Sweet Grass Creek Bridge
Photo taken by David Jones in July 2016
359042
Sweet Grass Creek Bridge
Photo taken by David Jones in July 2016
359043
Sweet Grass Creek Bridge
View from the west
Photo taken by David Jones in July 2016
Status: Open to traffic
Location: 45.662722,-110.116179
Carries CR 143 over West Boulder River
Design: truss/pony/pratt
Design Details: Pin-connected, 4-panel Pratt pony truss
Total Length: 62.0 Feet
Span Length: 60.0 Feet
Overview: Pony truss bridge over West Boulder River on CR 143
History: Built 1912
Built: 1912
Location: Sweet Grass County
View Bridge Information In Wayback Machine
394517
West Boulder River Bridge
View from the south
Photo taken by David Jones in June 2017
394518
West Boulder River Bridge
Builder's plaque
Photo taken by David Jones in June 2017
394519
West Boulder River Bridge
View from the East
Photo taken by David Jones in June 2017
394520
West Boulder River Bridge
Northeastern abutment
Photo taken by David Jones in June 2017
394521
West Boulder River Bridge
Turnbuckle
Photo taken by David Jones in June 2017
394522
West Boulder River Bridge
Center pin connection
Photo taken by David Jones in June 2017
394523
West Boulder River Bridge
southwestern portal
Photo taken by David Jones in June 2017
394524
West Boulder River Bridge
Pin connection
Photo taken by David Jones in June 2017
Status: No longer exists
Location: 45.789990,-110.065561
Carries CR 028 over Yellowstone River
Design: unknown
Design Details:
Total Length: 378.0 Feet
Span Length: 170.0 Feet
Overview: Lost through truss bridge over Yellowstone River on CR 028
History: Built 1914 by the Security Bridge Co.; replaced 2000
Built: 1911
Location: Sweet Grass County
View Bridge Information In Wayback Machine
119369
Long View, View To South-Southwest
Photo taken by Historic American Engineering Record
119370
3/4 View From North Bank, View To East
Photo taken by Historic American Engineering Record
119371
3/4 View From South Bank, View To North-Northwest
Photo taken by Historic American Engineering Record
119372
Long View, View To North-Northeast
Photo taken by Historic American Engineering Record
119373
South Portal, View To North-Northwest
Photo taken by Historic American Engineering Record
119374
3/4 View From North Shore, View To South-Southeast
Photo taken by Historic American Engineering Record
119375
3/4 View From South Bank, View To West
Photo taken by Historic American Engineering Record
119376
East Elevation, View To Southwest
Photo taken by Historic American Engineering Record
119377
3/4 View From North Bank, View To South
Photo taken by Historic American Engineering Record
119378
North Portal, View To Southeast
Photo taken by Historic American Engineering Record
119379
3/4 View From North Shore, View To South-Southeast
Photo taken by Historic American Engineering Record
119380
West Elevation, View To Northeast
Photo taken by Historic American Engineering Record
119381
Underside Of North Span And Center Pier, View To Southeast
Photo taken by Historic American Engineering Record
119382
Pier No. 1, View To Northwest
Photo taken by Historic American Engineering Record
119383
Pier No. 2, View To Northeast
Photo taken by Historic American Engineering Record
119384
Detail Shoring, Steelmaker's Mark
Photo taken by Historic American Engineering Record
Status: Replaced by new bridge
Location: 45.760000,-109.770000
Carries CR 001 over Yellowstone River
Design: truss/through/camelback
Design Details: Two pin-connected, 8-panel Camelback through trusses
Total Length: 340.0 Feet
Span Length: 170.0 Feet
Overview: Lost two-span through truss bridge over Yellowstone River on CR 001
History: Built 1911 by the Security Bridge Co.; relocated here 1918; replaced 1991
Built: 1911
Location: Sweet Grass County
View Bridge Information In Wayback Machine
119359
Profile, Facing Northwest
Photo taken by Historic American Engineering Record
119360
3/4 View, Facing Southwest
Photo taken by Historic American Engineering Record
119361
Northeast Portal, Facing Southwest
Photo taken by Historic American Engineering Record
119362
Southwest Portal, Facing Northeast
Photo taken by Historic American Engineering Record
119363
View Between Trusses, Facing Southwest
Photo taken by Historic American Engineering Record
119364
Detail Of Pin-Connection At Upper Chord, Facing North
Photo taken by Historic American Engineering Record
119365
Detail Of Pin-Connection At Lower Chord, Facing West
Photo taken by Historic American Engineering Record
119366
Detail Of Fixed End Of Truss At Abutment, Facing North
Photo taken by Historic American Engineering Record
119367
Floor System, Facing West
Photo taken by Historic American Engineering Record
119368
Detail Of Floor System, Facing South
Photo taken by Historic American Engineering Record
Status: Open to traffic
Location: 45.829881,-109.758530
Carries Farm Road over Sweet Grass Creek
Design: truss/pony/warren
Design Details: Warren pony truss
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Warren pony truss bridge over Sweet Grass Creek on Farm Road
History:
Built:
Location: Sweet Grass County
View Bridge Information In Wayback Machine
Status:
Location: 45.886286,-109.959328
Carries over
Design: unknown
Design Details:
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Bridge
History:
Built:
Location: Sweet Grass County
View Bridge Information In Wayback Machine
Status: Open to traffic
Location: 45.886222,-109.959314
Carries CR 012 over Big Timber Creek 022
Design: beam/stringer/wood
Design Details: Timber stringer
Total Length: 30.8 Feet
Span Length: 27.9 Feet
Overview: Timber stringer bridge over Big Timber Creek 022 on CR 012
History: Built 1965
Built: 1965
Location: Sweet Grass County
View Bridge Information In Wayback Machine
358862
CR 012 Bridge Over Big Timber Creek
South side of bridge
Photo taken by David Jones in July 2016
358863
CR 012 Bridge Over Big Timber Creek
Wood deck
Photo taken by David Jones in July 2016
358864
CR 012 Bridge Over Big Timber Creek
North side of bridge
Photo taken by David Jones in July 2016
358865
CR 012 Bridge Over Big Timber Creek
Support Structure
Photo taken by David Jones in July 2016
Status:
Location: 45.847058,-109.939853
Carries over
Design: unknown
Design Details:
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Bridge
History:
Built:
Location: Sweet Grass County
View Bridge Information In Wayback Machine
Status: Open to traffic
Location: 45.846850,-109.939897
Carries US 191 over Yellowstone River
Design: girder
Design Details: Girder
Total Length: 379.9 Feet
Span Length: 122.1 Feet
Overview: Girder bridge over Yellowstone River on US 191
History: Built 1938
Built: 1938
Location: Sweet Grass County
View Bridge Information In Wayback Machine
358962
Yellowstone River Bridge at Big Timber
View from the southwest
Photo taken by David Jones in July 2016
358963
Yellowstone River Bridge at Big Timber
Southeast Portal
Photo taken by David Jones in July 2016
358964
Yellowstone River Bridge at Big Timber
Photo taken by David Jones in July 2016
358965
Yellowstone River Bridge at Big Timber
View from the east
Photo taken by David Jones in July 2016
Status:
Location: 46.078854,-109.935743
Carries over
Design: unknown
Design Details:
Total Length: 0.0 Feet
Span Length: 0.0 Feet
Overview: Bridge
History:
Built:
Location: Sweet Grass County
View Bridge Information In Wayback Machine
Status: Open to traffic
Location: 46.078931,-109.935808
Carries US 191 over Sweet Grass Creek
Design: beam/stringer/steel
Design Details: Steel stringer
Total Length: 184.1 Feet
Span Length: 70.9 Feet
Overview: Steel stringer bridge over Sweet Grass Creek on US 191
History: Built 1947
Built: 1947
Location: Sweet Grass County
View Bridge Information In Wayback Machine
359165
Highway 191 Bridge Over Sweet Grass Creek
View from southeast
Photo taken by David Jones in July 2016
359166
Highway 191 Bridge Over Sweet Grass Creek
Railing & steel stringer
Photo taken by David Jones in July 2016
359167
Highway 191 Bridge Over Sweet Grass Creek
South Portal
Photo taken by David Jones in July 2016
Status: Open to traffic
Location: 45.731961,-109.679269
Carries US 10 over Bridger Creek 040
Design: beam/tee
Design Details: Concrete tee beam
Total Length: 96.1 Feet
Span Length: 32.2 Feet
Overview: Concrete tee beam bridge over Bridger Creek 040 on US 10
History: Built 1931
Built: 1931
Location: Sweet Grass County
View Bridge Information In Wayback Machine
452163
US 10 Bridger Creek Bridge
View from the south
Photo taken by David Jones in July 2019
452164
US 10 Bridger Creek Bridge
Western pier
Photo taken by David Jones in July 2019
452165
US 10 Bridger Creek Bridge
Eastern pier and abutment
Photo taken by David Jones in July 2019
452166
US 10 Bridger Creek Bridge
View from the southeast
Photo taken by David Jones in July 2019
452167
US 10 Bridger Creek Bridge
Eastern Portal
Photo taken by David Jones in July 2019
Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S - Dismantled and/or in storage. L - Severe loss of historic integrity due to alteration.
