US Bridges

Md 300 over Unicorn Branch

Fair

Queen Anne's County, Maryland · 1.4 Miles East of Md 313 · Structure no. 100000170025010

Built
1939
86 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
55 ft
3 main spans
Daily traffic
2,461
2018 count
Owner
State
State Highway Agency

About this bridge

Md 300 over Unicorn Branch is a wood or timber stringer/multi-beam or girder carrying Md 300 over Unicorn Branch in Queen Anne's County, Maryland. It was built in 1939, so it is 86 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 2,461 vehicles a day, roughly 9% of them trucks, projected to reach 2,469 by 2038. The structure is 55 ft (16.8 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 300
CrossesUnicorn Branch
Location1.4 Miles East of Md 313
RouteState Highway 300
CountyQueen Anne's County
StateMaryland
Coordinates39.19118, -75.8339
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating48.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length55 ft (16.8 m)
Longest span18 ft (5.5 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,461 (2018)
Projected traffic2,469 by 2038
Trucks9%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$111,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 300 over Unicorn Branch built?

It was built in 1939, making it 86 years old in 2025.

What condition is Md 300 over Unicorn 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 June 2023.

How much traffic does Md 300 over Unicorn Branch carry?

About 2,461 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is Md 300 over Unicorn Branch?

The structure is 55 ft (16.8 m) long with a longest span of 18 ft (5.5 m) and a deck 31 ft wide.

Who owns Md 300 over Unicorn Branch?

It is owned by the State Highway Agency.