US Bridges

NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top

Fair

Muskegon County, Michigan · 0.2 MI N of Muskegon · Structure no. 000000000007595

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
271 ft
3 main spans
Daily traffic
4,200
1988 count
Owner
State
State Highway Agency

About this bridge

NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top is a steel stringer/multi-beam or girder carrying NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top in Muskegon County, Michigan. It was built in 1964, so it is 61 years old, older than the Michigan average of 48.3 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 4,200 vehicles a day, roughly 8% of them trucks, projected to reach 2,100 by 1977. The structure is 271 ft (82.6 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesNB Ramp to WB Br
CrossesUS-31 SB&US-31 Br Eb(top
Location0.2 MI N of Muskegon
RouteU.S. Route 31
CountyMuskegon County
StateMichigan
Coordinates43.25738, -86.20654
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating79.7 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length271 ft (82.6 m)
Longest span93 ft (28.3 m)
Deck width28 ft (8.6 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (1988)
Projected traffic2,100 by 1977
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top built?

It was built in 1964, making it 61 years old in 2025.

What condition is NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top 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 July 2023.

How much traffic does NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top carry?

About 4,200 vehicles per day (1988 count), of which roughly 8% are trucks.

How long is NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top?

The structure is 271 ft (82.6 m) long with a longest span of 93 ft (28.3 m) and a deck 28 ft wide.

Who owns NB Ramp to WB Br over US-31 SB&US-31 Br Eb(top?

It is owned by the State Highway Agency.