US Bridges

Riley RD over Porter Creek

Fair

Shiawassee County, Michigan · 3.25 MI NW of Juddville · Structure no. 000000000009835

Built
1971
54 years old
Condition
Fair
inspected April 2024
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
130
1992 count
Owner
County
County Highway Agency

About this bridge

Riley RD over Porter Creek is a steel culvert carrying Riley RD over Porter Creek in Shiawassee County, Michigan. It was built in 1971, so it is 54 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 130 vehicles a day, roughly 5% of them trucks, projected to reach 235 by 2012. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRiley RD
CrossesPorter Creek
Location3.25 MI NW of Juddville
RouteCounty Highway 0
CountyShiawassee County
StateMichigan
Coordinates43.07284, -84.03539
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.9 US tons
Inventory rating32.2 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (1992)
Projected traffic235 by 2012
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Riley RD over Porter Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Riley RD over Porter Creek 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 2024.

How much traffic does Riley RD over Porter Creek carry?

About 130 vehicles per day (1992 count), of which roughly 5% are trucks.

How long is Riley RD over Porter Creek?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).

Who owns Riley RD over Porter Creek?

It is owned by the County Highway Agency.