IS 64 E
IS 64 E in S 18 T 45 N R 6 E, St. Louis County, Missouri received a condition grade of B (70/100). Built in 2008, the bridge carries 155K vehicles daily on IS 64 E over Cst Clayton RD Deer Cre.
IS 64 E carries a B on the BridgeSafety Condition Score with 70/100. 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 2008 and is 18 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 64 E carries an average daily traffic count of 155,290 vehicles, with 8 lane(s) crossing Cst Clayton RD Deer Cre. 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 64 E is a 18-year-old bridge located S 18 T 45 N R 6 E in St. Louis County, Missouri. The bridge carries IS 64 E over Cst Clayton RD Deer Cre with 8 traffic lanes, handling approximately 155K vehicles per day. Built in 2008, the structure spans 181.1 meters.
The bridge received a Condition Grade of B (70/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 6/9 (fair), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
IS 64 E has a Condition Score of 70/100 (Grade B). Its deck is rated 7/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
IS 64 E was built in 2008, making it 18 years old. The average bridge age in the United States is 48 years.
IS 64 E carries approximately 155K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 181.1 meters long and located on IS 64 E in S 18 T 45 N R 6 E, St. Louis County, Missouri.
No, IS 64 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 64 E is located S 18 T 45 N R 6 E in St. Louis County, Missouri. The bridge carries IS 64 E over Cst Clayton RD Deer Cre. Its coordinates are 38.636392, -90.395314. It is maintained by State Highway Agency.
IS 64 E carries IS 64 E over Cst Clayton RD Deer Cre. The bridge is 181.1 meters long and was built in 2008.
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.