US Bridges

Niner Road over South Branch Middle Run

Fair

Carroll County, Maryland · 0.59 MI N of Md 32 · Structure no. 200000CL0339020

Built
1974
51 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
756
2023 count
Owner
County
County Highway Agency

About this bridge

Niner Road over South Branch Middle Run is a concrete culvert carrying Niner Road over South Branch Middle Run in Carroll County, Maryland. It was built in 1974, so it is 51 years old, younger 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 756 vehicles a day, roughly 8% of them trucks, projected to reach 1,245 by 2043. The structure is 29 ft (8.8 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNiner Road
CrossesSouth Branch Middle Run
Location0.59 MI N of Md 32
RouteCounty Highway 539
CountyCarroll County
StateMaryland
Coordinates39.47517, -76.93538
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span12 ft (3.7 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic756 (2023)
Projected traffic1,245 by 2043
Trucks8%
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 Niner Road over South Branch Middle Run built?

It was built in 1974, making it 51 years old in 2025.

What condition is Niner Road over South Branch Middle Run 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 August 2023.

How much traffic does Niner Road over South Branch Middle Run carry?

About 756 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Niner Road over South Branch Middle Run?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.7 m) and a deck 32 ft wide.

Who owns Niner Road over South Branch Middle Run?

It is owned by the County Highway Agency.