US Bridges

Humphrey Road over Long Lake Inlet

Fair

Hillsdale County, Michigan · 0.3 MI W of Long Lake · Structure no. 000000000003354

Built
1994
31 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
255
2014 count
Owner
County
County Highway Agency

About this bridge

Humphrey Road over Long Lake Inlet is a prestressed concrete box beam or girders - multiple carrying Humphrey Road over Long Lake Inlet in Hillsdale County, Michigan. It was built in 1994, so it is 31 years old, younger 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 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 255 vehicles a day, projected to reach 418 by 2038. The structure is 38 ft (11.5 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesHumphrey Road
CrossesLong Lake Inlet
Location0.3 MI W of Long Lake
RouteCounty Highway 0
CountyHillsdale County
StateMichigan
Coordinates41.85733, -84.79461
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.7 US tons
Inventory rating44.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span35 ft (10.6 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic255 (2014)
Projected traffic418 by 2038
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Humphrey Road over Long Lake Inlet built?

It was built in 1994, making it 31 years old in 2025.

What condition is Humphrey Road over Long Lake Inlet 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 November 2024.

How much traffic does Humphrey Road over Long Lake Inlet carry?

About 255 vehicles per day (2014 count).

How long is Humphrey Road over Long Lake Inlet?

The structure is 38 ft (11.5 m) long with a longest span of 35 ft (10.6 m) and a deck 30 ft wide.

Who owns Humphrey Road over Long Lake Inlet?

It is owned by the County Highway Agency.