US Bridges

Md 28 WB over Rock Creek

Fair

Montgomery County, Maryland · 0.31 M E of Avery Road · Structure no. 100000150092014

Built
1970
55 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
320 ft
4 main spans
Daily traffic
24,840
2023 count
Owner
State
State Highway Agency

About this bridge

Md 28 WB over Rock Creek is a steel stringer/multi-beam or girder carrying Md 28 WB over Rock Creek in Montgomery County, Maryland. It was built in 1970, so it is 55 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 24,840 vehicles a day, roughly 8% of them trucks, projected to reach 29,834 by 2043. The structure is 320 ft (97.5 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMd 28 WB
CrossesRock Creek
Location0.31 M E of Avery Road
RouteState Highway 28
CountyMontgomery County
StateMaryland
Coordinates39.0944, -77.11712
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating64.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length320 ft (97.5 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,840 (2023)
Projected traffic29,834 by 2043
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 28 WB over Rock Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Md 28 WB over Rock Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Md 28 WB over Rock Creek carry?

About 24,840 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Md 28 WB over Rock Creek?

The structure is 320 ft (97.5 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns Md 28 WB over Rock Creek?

It is owned by the State Highway Agency.