US Bridges

Old Mill Road over Maryland Midland Railroa

PoorPosted for load

Frederick County, Maryland · 1000 Feet South of Md 77 · Structure no. 200000F-0409010

Built
1975
50 years old, rebuilt 1998
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
37 ft
3 main spans
Daily traffic
97
2023 count
Owner
County
County Highway Agency

About this bridge

Old Mill Road over Maryland Midland Railroa is a wood or timber stringer/multi-beam or girder carrying Old Mill Road over Maryland Midland Railroa in Frederick County, Maryland. It was built in 1975 and reconstructed in 1998, so it is 50 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 97 vehicles a day, roughly 1% of them trucks, projected to reach 145 by 2043. The structure is 37 ft (11.3 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesOld Mill Road
CrossesMaryland Midland Railroa
Location1000 Feet South of Md 77
RouteCounty Highway 546
Coordinates39.65651, -77.33477
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating20.9 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span18 ft (5.5 m)
Deck width17 ft (5.2 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (2023)
Projected traffic145 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Old Mill Road over Maryland Midland Railroa built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1998.

What condition is Old Mill Road over Maryland Midland Railroa in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does Old Mill Road over Maryland Midland Railroa carry?

About 97 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Old Mill Road over Maryland Midland Railroa?

The structure is 37 ft (11.3 m) long with a longest span of 18 ft (5.5 m) and a deck 17 ft wide.

Who owns Old Mill Road over Maryland Midland Railroa?

It is owned by the County Highway Agency.