US Bridges

Shady Grove Road over Is 370

Good

Montgomery County, Maryland · 2.43 Mi. E. of I-270 · Structure no. 100000150149010

Built
1989
36 years old
Condition
Good
inspected June 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
221 ft
2 main spans
Daily traffic
53,010
2009 count
Owner
State
State Highway Agency

About this bridge

Shady Grove Road over Is 370 is a steel continuous girder and floorbeam system carrying Shady Grove Road over Is 370 in Montgomery County, Maryland. It was built in 1989, so it is 36 years old, younger 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 53,010 vehicles a day, roughly 5% of them trucks, projected to reach 28,121 by 2026. The structure is 221 ft (67.4 m) long and 123 ft wide.

CarriesShady Grove Road
CrossesIs 370
Location2.43 Mi. E. of I-270
RouteCounty Highway 212
Coordinates39.13009, -77.1626
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.5 US tons
Inventory rating45.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length221 ft (67.4 m)
Longest span116 ft (35.4 m)
Deck width123 ft (37.4 m)
Roadway width112 ft (34.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53,010 (2009)
Projected traffic28,121 by 2026
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Shady Grove Road over Is 370 built?

It was built in 1989, making it 36 years old in 2025.

What condition is Shady Grove Road over Is 370 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 June 2023.

How much traffic does Shady Grove Road over Is 370 carry?

About 53,010 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Shady Grove Road over Is 370?

The structure is 221 ft (67.4 m) long with a longest span of 116 ft (35.4 m) and a deck 123 ft wide.

Who owns Shady Grove Road over Is 370?

It is owned by the State Highway Agency.