US Bridges

Martin L King Ave over 48th Ave/Boniface Ext

Good

Anchorage Municipality, Alaska · Mile Point 0.1 · Structure no. 2242

Built
2010
15 years old
Condition
Good
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
88 ft
1 main span
Daily traffic
15,800
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Martin L King Ave over 48th Ave/Boniface Ext is a prestressed concrete tee beam carrying Martin L King Ave over 48th Ave/Boniface Ext in Anchorage Municipality, Alaska. It was built in 2010, so it is 15 years old, younger than the Alaska average of 35.9 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 15,800 vehicles a day, roughly 2% of them trucks, projected to reach 19,500 by 2039. The structure is 88 ft (26.8 m) long and 93 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMartin L King Ave
Crosses48th Ave/Boniface Ext
LocationMile Point 0.1
RouteCity Street 0
CountyAnchorage Municipality
StateAlaska
Coordinates61.17806, -149.79611
Functional classRural Minor Arterial

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.7 US tons
Inventory rating44.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length88 ft (26.8 m)
Longest span85 ft (25.9 m)
Deck width93 ft (28.4 m)
Roadway width57 ft (17.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2020)
Projected traffic19,500 by 2039
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Martin L King Ave over 48th Ave/Boniface Ext built?

It was built in 2010, making it 15 years old in 2025.

What condition is Martin L King Ave over 48th Ave/Boniface Ext 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 August 2023.

How much traffic does Martin L King Ave over 48th Ave/Boniface Ext carry?

About 15,800 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Martin L King Ave over 48th Ave/Boniface Ext?

The structure is 88 ft (26.8 m) long with a longest span of 85 ft (25.9 m) and a deck 93 ft wide.

Who owns Martin L King Ave over 48th Ave/Boniface Ext?

It is owned by the City or Municipal Highway Agency.