Bridge Type
Main Span(s): Concrete continuous [2] Tee beam [04]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Monolithic Concrete (concurrently placed with structural deck) [1]
Bridge Dimensions
Length: 30.5 m = 100.1 ft
Main Spans: 3 at 18.3 m = 60.0 ft
Approach Spans: 0
Skew: 40
Width, Roadway: 7.9 m = 25.9 ft (2 Lanes) and Out-To-Out: 9.1 m = 29.9 ft for a 7.9 m = 25.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Cascade County [013], Montana [30]
Owned by State Highway Agency [01], DOT District: 3
1M N NEIHART
Condition
Deck: Very Good [8]
Superstructure: Good [7]
Substructure: Good [7]
Loading
Design: MS 18 / HS 20 [5]
Operating: 40.8 metric ton = 44.9 tons (Load and Resistance Factor(LRFR) [3])
Inventory: 29 metric ton = 31.9 tons (Load and Resistance Factor(LRFR) [3])
Appraisal
Structural: Better than present minimum criteria [7]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Better than present minimum criteria [7]
Waterway: Better than present minimum criteria [7] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: January 2020 [0120] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 19.9 km = 12.3 mi
Traffic
ADT: 522 (2019) and Trucks: 9%
Future ADT: 548 (In 2039
)
