IH 45
IH 45 in 1.15 MI S Of Sh 242, Montgomery County, Texas received a condition grade of F (0/100). Built in 2001, the bridge carries 171K vehicles daily on IH 45 over Carters Slough Trib. It is classified as structurally deficient.
IH 45 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 2001, making it 25 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. IH 45 carries an average daily traffic count of 170,688 vehicles, with 14 lane(s) crossing Carters Slough Trib. 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 is a 25-year-old bridge located 1.15 MI S Of Sh 242 in Montgomery County, Texas. The bridge carries IH 45 over Carters Slough Trib with 14 traffic lanes, handling approximately 171K vehicles per day. Built in 2001, the structure spans 11.3 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
IH 45 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.
IH 45 was built in 2001, making it 25 years old. The average bridge age in the United States is 48 years.
IH 45 carries approximately 171K vehicles per day (average daily traffic). The bridge has 14 traffic lanes. It is 11.3 meters long and located on IH 45 in 1.15 MI S Of Sh 242, Montgomery County, Texas.
Yes, IH 45 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.
IH 45 is located 1.15 MI S Of Sh 242 in Montgomery County, Texas. The bridge carries IH 45 over Carters Slough Trib. Its coordinates are 30.190836, -95.452850. It is maintained by State Highway Agency.
IH 45 carries IH 45 over Carters Slough Trib. The bridge is 11.3 meters long and was built in 2001.
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.