I-78
I-78 in 1 MI East Of Rt 31, Hunterdon County, New Jersey received a condition grade of F (0/100). Built in 1941, the bridge carries 130K vehicles daily on I-78 over Beaver Brook. It is classified as structurally deficient.
I-78 carries an F on the BridgeSafety Condition Score with 0/100 — the bottom tier of the FHWA NBI distribution. Component ratings flag the structure for near-term rehabilitation or replacement; the bridge may remain open to traffic but is on the priority list for action.
The bridge was built in 1941, making it 85 years old — well beyond the typical 50-year design life of bridges constructed in that era. Bridges of this vintage usually need substantial rehabilitation or replacement once their original components have aged out, regardless of current condition ratings. I-78 carries an average daily traffic count of 130,244 vehicles, with 8 lane(s) crossing Beaver Brook. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I-78 is a 85-year-old bridge located 1 MI East Of Rt 31 in Hunterdon County, New Jersey. The bridge carries I-78 over Beaver Brook with 8 traffic lanes, handling approximately 130K vehicles per day. Built in 1941 and reconstructed in 1968, the structure spans 9.1 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below, this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-78 has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
I-78 was built in 1941 and reconstructed in 1968, making it 85 years old. The average bridge age in the United States is 48 years.
I-78 carries approximately 130K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 9.1 meters long and located on I-78 in 1 MI East Of Rt 31, Hunterdon County, New Jersey.
Yes, I-78 is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
I-78 is located 1 MI East Of Rt 31 in Hunterdon County, New Jersey. The bridge carries I-78 over Beaver Brook. Its coordinates are 40.639439, -74.879439. It is maintained by State Highway Agency.
I-78 carries I-78 over Beaver Brook. The bridge is 9.1 meters long and was built in 1941, with reconstruction in 1968.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.