I-93 US 4 NB over Merrimack River

Fair Condition67 years old25,855 vehicles/day

Location

StateNew Hampshire
CountyMerrimack
Location1.5 Mi N. Jct. Rt.3
CarriesI-93 US 4 NB
CrossesMerrimack River
Coordinates43.22947, -71.53622

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure5 (Fair)
Substructure5 (Fair)
Channel/Waterway7 (Good)
Scour Critical3 — Scour critical

Physical Characteristics

MaterialSteel Continuous
DesignGirder and Floorbeam
Total Length524.0 ft (159.7 m)
Max Span188.0 ft (57.3 m)
Deck Width62.0 ft (18.9 m)
Deck Area3018.3 sq m
Main Spans3
Year Built1959 (reconstructed 1988)

Traffic

Avg Daily Traffic25,855 (2023)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last Inspection824
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number005201360011700

Nearby Bridges