Bridge Type
Main Span(s): Steel [3] Truss - Thru [10]
Approach Span(s): Wood or timber [7] Stringer/Multi-beam or girder [02]
Deck: Wood or Timber [8] with Wearing Surface: Wood or Timber [7]
Bridge Dimensions
Length: 83.2 m = 273.0 ft
Main Spans: 2 at 32.3 m = 106.0 ft
Approach Spans: 4
Skew: 0
Width, Roadway: 3.4 m = 11.2 ft (1 Lanes) and Out-To-Out: 3.7 m = 12.1 ft for a 3.7 m = 12.1 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Unknown [00000]: Lewis and Clark County [049], Montana [30]
Owned by U.S. Forest Service [64], DOT District: 0
HANNAN GULCH
Condition
Deck: Good [7]
Superstructure: Good [7]
Substructure: Poor [4]
Loading
Design: M 9 / H 10 [1]
Operating: 21.4 metric ton = 23.5 tons (Load and Resistance Factor Rating (LRFR) rating reported by rating factor (RF) method using HL-93 loadings [8])
Inventory: 15.9 metric ton = 17.5 tons (Load and Resistance Factor Rating (LRFR) rating reported by rating factor (RF) method using HL-93 loadings [8])
Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Basically intolerable requiring high priority of corrrective action [3]
Road Alignment: Equal to present minimum criteria [6]
Waterway: Superior to present desirable criteria [9] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: September 1999 [999] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 15.8 km = 9.8 mi
Traffic
ADT: 99 (0) and Trucks: 0%
Future ADT: 148 (In 2041
)