Bridge Type
Main Span(s): Steel continuous [4] Stringer/Multi-beam or girder [02]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Monolithic Concrete (concurrently placed with structural deck) [1]
Bridge Dimensions
Length: 356.4 m = 1169.3 ft
Main Spans: 4 at 86.9 m = 285.1 ft
Approach Spans: 2
Skew: 0
Width, Roadway: 12.6 m = 41.3 ft (2 Lanes) and Out-To-Out: 13.5 m = 44.3 ft for a 11.6 m = 38.1 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Prairie County [079], Montana [30]
Owned by State Highway Agency [01], DOT District: 4
1M N FALLON
Condition
Deck: Poor [4]
Superstructure: Fair [5]
Substructure: Satisfactory [6]
Loading
Design: HL93 [A]
Operating: 41.7 metric ton = 45.9 tons (Load and Resistance Factor(LRFR) [3])
Inventory: 32.7 metric ton = 36.0 tons (Load and Resistance Factor(LRFR) [3])
Appraisal
Structural: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Deck Geometry: Better than present minimum criteria [7]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: July 1999 [799] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 0 km = 0.0 mi
Traffic
ADT: 2211 (2019) and Trucks: 23%
Future ADT: 4997 (In 2039
)