US Bridges

ST Johns Lane over Is 70

Fair

Howard County, Maryland · 0.8 MI W of US 29 · Structure no. 100000130040010

Built
1966
59 years old, rebuilt 1974
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
229 ft
4 main spans
Daily traffic
4,382
1994 count
Owner
State
State Highway Agency

About this bridge

ST Johns Lane over Is 70 is a steel stringer/multi-beam or girder carrying ST Johns Lane over Is 70 in Howard County, Maryland. It was built in 1966 and reconstructed in 1974, so it is 59 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 4,382 vehicles a day, roughly 5% of them trucks, projected to reach 8,817 by 2012. The structure is 229 ft (69.8 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST Johns Lane
CrossesIs 70
Location0.8 MI W of US 29
RouteCounty Highway 272
CountyHoward County
StateMaryland
Coordinates39.29641, -76.84092
Functional classUrban Collector

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length229 ft (69.8 m)
Longest span79 ft (24.1 m)
Deck width40 ft (12.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,382 (1994)
Projected traffic8,817 by 2012
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$607,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was ST Johns Lane over Is 70 built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1974.

What condition is ST Johns Lane over Is 70 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 April 2023.

How much traffic does ST Johns Lane over Is 70 carry?

About 4,382 vehicles per day (1994 count), of which roughly 5% are trucks.

How long is ST Johns Lane over Is 70?

The structure is 229 ft (69.8 m) long with a longest span of 79 ft (24.1 m) and a deck 40 ft wide.

Who owns ST Johns Lane over Is 70?

It is owned by the State Highway Agency.