US Bridges

Irishtown Road over Flat Run

Good

Frederick County, Maryland · 0.8 MI North of Emmitsbrg · Structure no. 200000F-0521030

Built
1982
43 years old
Condition
Good
inspected April 2023
Type
Culvert
Steel
Length
35 ft
Daily traffic
201
2022 count
Owner
County
County Highway Agency

About this bridge

Irishtown Road over Flat Run is a steel culvert carrying Irishtown Road over Flat Run in Frederick County, Maryland. It was built in 1982, so it is 43 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 201 vehicles a day, roughly 2% of them trucks, projected to reach 258 by 2052. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesIrishtown Road
CrossesFlat Run
Location0.8 MI North of Emmitsbrg
RouteCounty Highway 41
CountyFrederick County
StateMaryland
Coordinates39.71854, -77.32747
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans0
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span0 ft (0 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic201 (2022)
Projected traffic258 by 2052
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Irishtown Road over Flat Run built?

It was built in 1982, making it 43 years old in 2025.

What condition is Irishtown Road over Flat Run 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 April 2023.

How much traffic does Irishtown Road over Flat Run carry?

About 201 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Irishtown Road over Flat Run?

The structure is 35 ft (10.7 m) long.

Who owns Irishtown Road over Flat Run?

It is owned by the County Highway Agency.