US Bridges

US 220 over Mill Run

Fair

Allegany County, Maryland · 1.88 MI S of Md 830B · Structure no. 100000010075010

Built
1929
96 years old, rebuilt 1955
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
7,111
2009 count
Owner
State
State Highway Agency

About this bridge

US 220 over Mill Run is a concrete slab carrying US 220 over Mill Run in Allegany County, Maryland. It was built in 1929 and reconstructed in 1955, so it is 96 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 7,111 vehicles a day, roughly 8% of them trucks, projected to reach 8,418 by 2026. The structure is 30 ft (9.1 m) long and 46 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesUS 220
CrossesMill Run
Location1.88 MI S of Md 830B
RouteU.S. Route 220
CountyAllegany County
StateMaryland
Coordinates39.51328, -78.91863
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length30 ft (9.1 m)
Longest span11 ft (3.4 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,111 (2009)
Projected traffic8,418 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 US 220 over Mill Run built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1955.

What condition is US 220 over Mill Run 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 November 2024.

How much traffic does US 220 over Mill Run carry?

About 7,111 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is US 220 over Mill Run?

The structure is 30 ft (9.1 m) long with a longest span of 11 ft (3.4 m) and a deck 46 ft wide.

Who owns US 220 over Mill Run?

It is owned by the State Highway Agency.