US Bridges

US 29 over Is 495

Good

Montgomery County, Maryland · 0.34 Mile South of Md 193 · Structure no. 100000150135010

Built
1959
66 years old, rebuilt 2004
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
255 ft
4 main spans
Daily traffic
56,842
2009 count
Owner
State
State Highway Agency

About this bridge

US 29 over Is 495 is a steel stringer/multi-beam or girder carrying US 29 over Is 495 in Montgomery County, Maryland. It was built in 1959 and reconstructed in 2004, so it is 66 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 56,842 vehicles a day, roughly 8% of them trucks, projected to reach 62,045 by 2026. The structure is 255 ft (77.7 m) long and 125 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesUS 29
CrossesIs 495
Location0.34 Mile South of Md 193
RouteU.S. Route 29
CountyMontgomery County
StateMaryland
Coordinates39.01558, -77.01646
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating68.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length255 ft (77.7 m)
Longest span81 ft (24.7 m)
Deck width125 ft (38.1 m)
Roadway width96 ft (29.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,842 (2009)
Projected traffic62,045 by 2026
Trucks8%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 29 over Is 495 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2004.

What condition is US 29 over Is 495 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does US 29 over Is 495 carry?

About 56,842 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 29 over Is 495?

The structure is 255 ft (77.7 m) long with a longest span of 81 ft (24.7 m) and a deck 125 ft wide.

Who owns US 29 over Is 495?

It is owned by the State Highway Agency.