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Nearby Bridges in NBI 2021: 1


BRIDGE ROAD over BLACKWATER RIVER (Route: 0)
Num:800830009800x
Open: no restriction [A]
Built: 1882, Reconstructed: N/A [0000]
Historic: Bridge is eligible for the NRHP. [2]

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Rough Distance: 0 Miles (0 Kilometers)

Bridge Type
Main Span(s): Wood or timber [7] Truss - Thru [10]
Approach Span(s): Other [00]
Deck: Wood or Timber [8] with Wearing Surface: Wood or Timber [7]
Bridge Dimensions
Length: 19.8 m = 65.0 ft
Main Spans: 1 at 15.8 m = 51.8 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 2.7 m = 8.9 ft (1 Lanes) and Out-To-Out: 5.8 m = 19.0 ft for a 4.9 m = 16.1 ft approaching roadway.
Vertical Clearance: 3.58 m = 11.7 ft and Navigational Clearance: 0 = N/A
Location
Andover [01460]: Merrimack County [013], New Hampshire [33]
Owned by City or Municipal Highway Agency [04], DOT District: 2
0.1 MI S NH 11
Condition
Deck: Satisfactory [6]
Superstructure: Poor [4]
Substructure: Good [7]
Loading
Design:
Operating: 27.8 metric ton = 30.6 tons (Allowable Stress(AS) [2])
Inventory: 20.9 metric ton = 23.0 tons (Allowable Stress(AS) [2])
Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Basically intolerable requiring high priority of replacement [2]
Road Alignment: Equal to present minimum criteria [6]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: October 2020 [1020] and Frequency: 16
Future Work
Work Needed: Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Bridge Detour: 0.2 km = 0.1 mi
Traffic
ADT: 91 (2019) and Trucks: 4%
Future ADT: 134 (In 2041 )

Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S  - Dismantled and/or in storage. L -  Severe loss of historic integrity due to alteration.

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