Bridge Type
Main Span(s): Steel [3] Truss - Deck [09]
Approach Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Bituminous [6]
Bridge Dimensions
Length: 134.1 m = 440.0 ft
Main Spans: 1 at 51.2 m = 168.0 ft
Approach Spans: 2
Skew: 0
Width, Roadway: 13.2 m = 43.3 ft (2 Lanes) and Out-To-Out: 14.4 m = 47.2 ft for a 13.5 m = 44.3 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Allenstown [00660]: Merrimack County [013], New Hampshire [33]
Owned by State Highway Agency [01], DOT District: 5
PEMBROKE-ALLENSTOWN TL
Condition
Deck: Very Good [8]
Superstructure: Very Good [8]
Substructure: Very Good [8]
Loading
Design: MS 22.5 / HS 25 or greater [9]
Operating: 68 metric ton = 74.8 tons ()
Inventory: 40.8 metric ton = 44.9 tons ()
Appraisal
Structural: Equal to present desirable criteria [8]
Deck Geometry: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Road Alignment: Meets minimum tolerable limits to be left in place as is [4]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: April 1999 [499] 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: 2.7 km = 1.7 mi
Traffic
ADT: 9226 (2019) and Trucks: 7%
Future ADT: 13654 (In 2041
)
