US Bridges

Monroe Street over I-170

Fair

Baltimore city, Maryland · 0.1 MI S of Franklin ST · Structure no. 200000BC1212010

Built
1976
49 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
264 ft
3 main spans
Daily traffic
21,635
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Monroe Street over I-170 is a concrete continuous box beam or girders - single or spread carrying Monroe Street over I-170 in Baltimore city, Maryland. It was built in 1976, so it is 49 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 5 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 21,635 vehicles a day, roughly 5% of them trucks, projected to reach 26,398 by 2042. The structure is 264 ft (80.5 m) long and 78 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMonroe Street
CrossesI-170
Location0.1 MI S of Franklin ST
RouteState Highway 43
CountyBaltimore city
StateMaryland
Coordinates39.29378, -76.64736
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45.5 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length264 ft (80.5 m)
Longest span102 ft (31.1 m)
Deck width78 ft (23.8 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,635 (2022)
Projected traffic26,398 by 2042
Trucks5%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$175,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Monroe Street over I-170 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Monroe Street over I-170 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 2024.

How much traffic does Monroe Street over I-170 carry?

About 21,635 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Monroe Street over I-170?

The structure is 264 ft (80.5 m) long with a longest span of 102 ft (31.1 m) and a deck 78 ft wide.

Who owns Monroe Street over I-170?

It is owned by the City or Municipal Highway Agency.