US Bridges

Md 100 over CSX RR Oconnor RD

Good

Howard County, Maryland · 0.24 M W of Aa CO Line · Structure no. 100000130149013

Built
1996
29 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
231 ft
2 main spans
Daily traffic
83,402
2009 count
Owner
State
State Highway Agency

About this bridge

Md 100 over CSX RR Oconnor RD is a steel continuous stringer/multi-beam or girder carrying Md 100 over CSX RR Oconnor RD in Howard County, Maryland. It was built in 1996, so it is 29 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 83,402 vehicles a day, roughly 8% of them trucks, projected to reach 505,255 by 2026. The structure is 231 ft (70.4 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMd 100
CrossesCSX RR Oconnor RD
Location0.24 M W of Aa CO Line
RouteState Highway 100
Coordinates39.18205, -76.74496
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating55 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length231 ft (70.4 m)
Longest span120 ft (36.6 m)
Deck width55 ft (16.8 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83,402 (2009)
Projected traffic505,255 by 2026
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 100 over CSX RR Oconnor RD built?

It was built in 1996, making it 29 years old in 2025.

What condition is Md 100 over CSX RR Oconnor RD 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 July 2023.

How much traffic does Md 100 over CSX RR Oconnor RD carry?

About 83,402 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 100 over CSX RR Oconnor RD?

The structure is 231 ft (70.4 m) long with a longest span of 120 ft (36.6 m) and a deck 55 ft wide.

Who owns Md 100 over CSX RR Oconnor RD?

It is owned by the State Highway Agency.