US Bridges

Keysville-Frederic over Monocacy River

Fair

Carroll County, Maryland · On Fred CO Line · Structure no. 200000CL0201010

Built
1900
125 years old, rebuilt 1978
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
192 ft
2 main spans
Daily traffic
260
2021 count
Owner
County
County Highway Agency

About this bridge

Keysville-Frederic over Monocacy River is a steel continuous stringer/multi-beam or girder carrying Keysville-Frederic over Monocacy River in Carroll County, Maryland. It was built in 1900 and reconstructed in 1978, so it is 125 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 6 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 260 vehicles a day, roughly 8% of them trucks, projected to reach 427 by 2041. The structure is 192 ft (58.5 m) long and 19 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesKeysville-Frederic
CrossesMonocacy River
LocationOn Fred CO Line
RouteCounty Highway 13
CountyCarroll County
StateMaryland
Coordinates39.65463, -77.26708
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating81 US tons
Inventory rating48.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length192 ft (58.5 m)
Longest span94 ft (28.7 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2021)
Projected traffic427 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$550,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Keysville-Frederic over Monocacy River built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1978.

What condition is Keysville-Frederic over Monocacy River 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 May 2023.

How much traffic does Keysville-Frederic over Monocacy River carry?

About 260 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Keysville-Frederic over Monocacy River?

The structure is 192 ft (58.5 m) long with a longest span of 94 ft (28.7 m) and a deck 19 ft wide.

Who owns Keysville-Frederic over Monocacy River?

It is owned by the County Highway Agency.