US Bridges

Md 311 over Coolspring Branch

Fair

Caroline County, Maryland · 0.3 M N of Gooden Road · Structure no. 100000050025030

Built
1952
73 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
25 ft
3 main spans
Daily traffic
3,230
2009 count
Owner
State
State Highway Agency

About this bridge

Md 311 over Coolspring Branch is a concrete culvert carrying Md 311 over Coolspring Branch in Caroline County, Maryland. It was built in 1952, so it is 73 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 3,230 vehicles a day, roughly 8% of them trucks, projected to reach 4,170 by 2029. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesMd 311
CrossesCoolspring Branch
Location0.3 M N of Gooden Road
RouteState Highway 311
CountyCaroline County
StateMaryland
Coordinates39.08874, -75.75942
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.5 US tons
Inventory rating23.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span4 ft (1.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,230 (2009)
Projected traffic4,170 by 2029
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Md 311 over Coolspring Branch built?

It was built in 1952, making it 73 years old in 2025.

What condition is Md 311 over Coolspring Branch 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 Md 311 over Coolspring Branch carry?

About 3,230 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 311 over Coolspring Branch?

The structure is 25 ft (7.6 m) long with a longest span of 4 ft (1.2 m).

Who owns Md 311 over Coolspring Branch?

It is owned by the State Highway Agency.