IS 270
IS 270 in 1.53 Mile South Of Md 117, Montgomery County, Maryland received a condition grade of B (74/100). Built in 1989, the bridge carries 216K vehicles daily on IS 270 over Is 370 And Ramp B.
IS 270 carries a B on the BridgeSafety Condition Score with 74/100. 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 1989, making it 37 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. IS 270 carries an average daily traffic count of 216,270 vehicles, with 12 lane(s) crossing Is 370 And Ramp B. 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 is a 37-year-old bridge located 1.53 Mile South Of Md 117 in Montgomery County, Maryland. The bridge carries IS 270 over Is 370 And Ramp B with 12 traffic lanes, handling approximately 216K vehicles per day. Built in 1989, the structure spans 94.8 meters.
The bridge received a Condition Grade of B (74/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 6/9 (fair), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
IS 270 has a Condition Score of 74/100 (Grade B). Its deck is rated 7/9, superstructure 6/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
IS 270 was built in 1989, making it 37 years old. The average bridge age in the United States is 48 years.
IS 270 carries approximately 216K vehicles per day (average daily traffic). The bridge has 12 traffic lanes. It is 94.8 meters long and located on IS 270 in 1.53 Mile South Of Md 117, Montgomery County, Maryland.
No, IS 270 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 is located 1.53 Mile South Of Md 117 in Montgomery County, Maryland. The bridge carries IS 270 over Is 370 And Ramp B. Its coordinates are 39.121200, -77.197817. It is maintained by State Highway Agency.
IS 270 carries IS 270 over Is 370 And Ramp B. The bridge is 94.8 meters long and was built in 1989.
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.