I 84 EBL & WBL
I 84 EBL & WBL in 6.7 W. Boise, Ada County, Idaho received a condition grade of B (65/100). Built in 1966, the bridge carries 145K vehicles daily on I 84 EBL & WBL over Ridenbaugh Canal.
I 84 EBL & WBL carries a B on the BridgeSafety Condition Score with 65/100. 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 1966 and is now 60 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 84 EBL & WBL carries an average daily traffic count of 144,500 vehicles, with 8 lane(s) crossing Ridenbaugh Canal. 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 84 EBL & WBL is a 60-year-old bridge located 6.7 W. Boise in Ada County, Idaho. The bridge carries I 84 EBL & WBL over Ridenbaugh Canal with 8 traffic lanes, handling approximately 145K vehicles per day. Built in 1966 and reconstructed in 1994, the structure spans 9.1 meters.
The bridge received a Condition Grade of B (65/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 7/9 (good), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
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Frequently Asked Questions
I 84 EBL & WBL has a Condition Score of 65/100 (Grade B). Its deck is rated 6/9, superstructure 7/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I 84 EBL & WBL was built in 1966 and reconstructed in 1994, making it 60 years old. The average bridge age in the United States is 48 years.
I 84 EBL & WBL carries approximately 145K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 9.1 meters long and located on I 84 EBL & WBL in 6.7 W. Boise, Ada County, Idaho.
No, I 84 EBL & WBL 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 84 EBL & WBL is located 6.7 W. Boise in Ada County, Idaho. The bridge carries I 84 EBL & WBL over Ridenbaugh Canal. Its coordinates are 43.597278, -116.340139. It is maintained by State Highway Agency.
I 84 EBL & WBL carries I 84 EBL & WBL over Ridenbaugh Canal. The bridge is 9.1 meters long and was built in 1966, with reconstruction in 1994.
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.