Bridge Type
Main Span(s): Steel [3] Truss - Thru [10]
Approach Span(s): Other [00]
Deck: Wood or Timber [8] with Wearing Surface: Wood or Timber [7]
Bridge Dimensions
Length: 30.8 m = 101.1 ft
Main Spans: 1 at 30.5 m = 100.1 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 4.8 m = 15.7 ft (1 Lanes) and Out-To-Out: 4.9 m = 16.1 ft for a 7.3 m = 24.0 ft approaching roadway.
Vertical Clearance: 3.73 m = 12.2 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Lewis and Clark County [049], Montana [30]
Owned by County Highway Agency [02], DOT District: 3
7M SW SIEBEN INT
Condition
Deck: Good [7]
Superstructure: Satisfactory [6]
Substructure: Fair [5]
Loading
Design:
Operating: 5.4 metric ton = 5.9 tons (Load and Resistance Factor(LRFR) [3])
Inventory: 4.5 metric ton = 5.0 tons (Load and Resistance Factor(LRFR) [3])
Appraisal
Structural: Basically intolerable requiring high priority of replacement [2]
Deck Geometry: Basically intolerable requiring high priority of replacement [2]
Road Alignment: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Waterway: Better than present minimum criteria [7] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: November 1999 [1199] and Frequency: 24
Future Work
Work Needed: Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Bridge Detour: 5.6 km = 3.5 mi
Traffic
ADT: 54 (2019) and Trucks: 0%
Future ADT: 57 (In 2039
)
