US Bridges

Harney Road over Monocacy River

Good

Frederick County, Maryland · At Carroll County Line · Structure no. 200000F-0501010

Built
1989
36 years old
Condition
Good
inspected September 2023
Type
Truss - Thru
Steel
Length
387 ft
5 main spans
Daily traffic
815
2019 count
Owner
County
County Highway Agency

About this bridge

Harney Road over Monocacy River is a steel truss - thru carrying Harney Road over Monocacy River in Frederick 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 815 vehicles a day, roughly 10% of them trucks, projected to reach 1,215 by 2039. The structure is 387 ft (118 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHarney Road
CrossesMonocacy River
LocationAt Carroll County Line
RouteCounty Highway 43
CountyFrederick County
StateMaryland
Coordinates39.71387, -77.21654
Functional classRural Minor Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.4 US tons
Inventory rating25 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans5 (+4 approach)
Design loadHS 15
Structure length387 ft (118 m)
Longest span118 ft (36 m)
Deck width21 ft (6.5 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic815 (2019)
Projected traffic1,215 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Harney Road over Monocacy River built?

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

What condition is Harney Road over Monocacy River 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 September 2023.

How much traffic does Harney Road over Monocacy River carry?

About 815 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Harney Road over Monocacy River?

The structure is 387 ft (118 m) long with a longest span of 118 ft (36 m) and a deck 21 ft wide.

Who owns Harney Road over Monocacy River?

It is owned by the County Highway Agency.