I-69 WB
I-69 WB in 0.3 MI NE Of M-71, Shiawassee County, Michigan received a condition grade of C (59/100). Built in 1961, the bridge carries 192K vehicles daily on I-69 WB over Holly Drain.
I-69 WB carries a C on the BridgeSafety Condition Score with 59/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1961 and is now 65 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. I-69 WB carries an average daily traffic count of 192,000 vehicles, with 2 lane(s) crossing Holly Drain. 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-69 WB is a 65-year-old bridge located 0.3 MI NE Of M-71 in Shiawassee County, Michigan. The bridge carries I-69 WB over Holly Drain with 2 traffic lanes, handling approximately 192K vehicles per day. Built in 1961, the structure spans 18.6 meters.
The bridge received a Condition Grade of C (59/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 6/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-69 WB has a Condition Score of 59/100 (Grade C). Its deck is rated 6/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-69 WB was built in 1961, making it 65 years old. The average bridge age in the United States is 48 years.
I-69 WB carries approximately 192K vehicles per day (average daily traffic). The bridge has 2 traffic lanes. It is 18.6 meters long and located on I-69 WB in 0.3 MI NE Of M-71, Shiawassee County, Michigan.
No, I-69 WB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I-69 WB is located 0.3 MI NE Of M-71 in Shiawassee County, Michigan. The bridge carries I-69 WB over Holly Drain. Its coordinates are 42.929000, -83.995297. It is maintained by State Highway Agency.
I-69 WB carries I-69 WB over Holly Drain. The bridge is 18.6 meters long and was built in 1961.
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.