IH 45 NB
IH 45 NB in 0.30 MI N Of Dallas ST, Harris County, Texas received a condition grade of B (71/100). Built in 1962, the bridge carries 230K vehicles daily on IH 45 NB over Ih 45 NB Houston Exit.
IH 45 NB carries a B on the BridgeSafety Condition Score with 71/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1962 and is now 64 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. IH 45 NB carries an average daily traffic count of 230,232 vehicles, with 3 lane(s) crossing Ih 45 NB Houston Exit. 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
IH 45 NB is a 64-year-old bridge located 0.30 MI N Of Dallas ST in Harris County, Texas. The bridge carries IH 45 NB over Ih 45 NB Houston Exit with 3 traffic lanes, handling approximately 230K vehicles per day. Built in 1962, the structure spans 23.2 meters.
The bridge received a Condition Grade of B (71/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
IH 45 NB has a Condition Score of 71/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
IH 45 NB was built in 1962, making it 64 years old. The average bridge age in the United States is 48 years.
IH 45 NB carries approximately 230K vehicles per day (average daily traffic). The bridge has 3 traffic lanes. It is 23.2 meters long and located on IH 45 NB in 0.30 MI N Of Dallas ST, Harris County, Texas.
No, IH 45 NB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
IH 45 NB is located 0.30 MI N Of Dallas ST in Harris County, Texas. The bridge carries IH 45 NB over Ih 45 NB Houston Exit. Its coordinates are 29.762214, -95.372242. It is maintained by State Highway Agency.
IH 45 NB carries IH 45 NB over Ih 45 NB Houston Exit. The bridge is 23.2 meters long and was built in 1962.
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.