IS 270 E
IS 270 E in S 22 T 46 N R 5 E, St. Louis County, Missouri received a condition grade of B (78/100). Built in 2009, the bridge carries 138K vehicles daily on IS 270 E over Cst Dorsett RD.
IS 270 E carries a B on the BridgeSafety Condition Score with 78/100. 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 2009 and is 17 years old — relatively young against the U.S. bridge stock. Modern bridges built to current FHWA standards generally outperform older structures on condition ratings. IS 270 E carries an average daily traffic count of 138,108 vehicles, with 8 lane(s) crossing Cst Dorsett RD. 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
IS 270 E is a 17-year-old bridge located S 22 T 46 N R 5 E in St. Louis County, Missouri. The bridge carries IS 270 E over Cst Dorsett RD with 8 traffic lanes, handling approximately 138K vehicles per day. Built in 2009, the structure spans 47.5 meters.
The bridge received a Condition Grade of B (78/100) 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
IS 270 E has a Condition Score of 78/100 (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.
IS 270 E was built in 2009, making it 17 years old. The average bridge age in the United States is 48 years.
IS 270 E carries approximately 138K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 47.5 meters long and located on IS 270 E in S 22 T 46 N R 5 E, St. Louis County, Missouri.
No, IS 270 E is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
IS 270 E is located S 22 T 46 N R 5 E in St. Louis County, Missouri. The bridge carries IS 270 E over Cst Dorsett RD. Its coordinates are 38.714539, -90.447328. It is maintained by State Highway Agency.
IS 270 E carries IS 270 E over Cst Dorsett RD. The bridge is 47.5 meters long and was built in 2009.
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.