US Bridges

Si Road over Hunters Brook

Fair

Marquette County, Michigan · 0.5 MI NE of Watson · Structure no. 000000000006615

Built
1930
95 years old, rebuilt 1994
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
70
2001 count
Owner
County
County Highway Agency

About this bridge

Si Road over Hunters Brook is a steel stringer/multi-beam or girder carrying Si Road over Hunters Brook in Marquette County, Michigan. It was built in 1930 and reconstructed in 1994, so it is 95 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 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 70 vehicles a day, projected to reach 90 by 2020. The structure is 37 ft (11.2 m) long and 16 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesSi Road
CrossesHunters Brook
Location0.5 MI NE of Watson
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.02395, -87.40888
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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating97.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length37 ft (11.2 m)
Longest span35 ft (10.6 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2001)
Projected traffic90 by 2020
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$90,000 (2050 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Si Road over Hunters Brook built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1994.

What condition is Si Road over Hunters Brook 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 October 2024.

How much traffic does Si Road over Hunters Brook carry?

About 70 vehicles per day (2001 count).

How long is Si Road over Hunters Brook?

The structure is 37 ft (11.2 m) long with a longest span of 35 ft (10.6 m) and a deck 16 ft wide.

Who owns Si Road over Hunters Brook?

It is owned by the County Highway Agency.