US Bridges

Mummaford Road over Monocacy River

Poor

Carroll County, Maryland · 4.3 M E Keysville Road · Structure no. 200000CL0227010

Built
1911
114 years old, rebuilt 1988
Condition
Poor
inspected November 2024
Type
Truss - Thru
Steel
Length
229 ft
2 main spans
Daily traffic
268
2022 count
Owner
County
County Highway Agency

About this bridge

Mummaford Road over Monocacy River is a steel truss - thru carrying Mummaford Road over Monocacy River in Carroll County, Maryland. It was built in 1911 and reconstructed in 1988, so it is 114 years old, older 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.

It carries about 268 vehicles a day, roughly 8% of them trucks, projected to reach 439 by 2042. The structure is 229 ft (69.8 m) long and 16 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesMummaford Road
CrossesMonocacy River
Location4.3 M E Keysville Road
RouteCounty Highway 15
CountyCarroll County
StateMaryland
Coordinates39.62357, -77.29964
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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating59 US tons
Inventory rating42 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans2
Design loadHS 20
Structure length229 ft (69.8 m)
Longest span114 ft (34.7 m)
Deck width16 ft (4.9 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic268 (2022)
Projected traffic439 by 2042
Trucks8%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mummaford Road over Monocacy River built?

It was built in 1911, making it 114 years old in 2025. It was reconstructed in 1988.

What condition is Mummaford Road over Monocacy River 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 November 2024.

How much traffic does Mummaford Road over Monocacy River carry?

About 268 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Mummaford Road over Monocacy River?

The structure is 229 ft (69.8 m) long with a longest span of 114 ft (34.7 m) and a deck 16 ft wide.

Who owns Mummaford Road over Monocacy River?

It is owned by the County Highway Agency.