US Bridges

Sibley Road (east) over Letts Creek

PoorPosted for load

Washtenaw County, Michigan · Sylvan Twp Sec 2 · Structure no. 000000000013915

Built
1968
57 years old
Condition
Poor
inspected September 2024
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
200
2014 count
Owner
County
County Highway Agency

About this bridge

Sibley Road (east) over Letts Creek is a steel culvert carrying Sibley Road (east) over Letts Creek in Washtenaw County, Michigan. It was built in 1968, so it is 57 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, projected to reach 230 by 2034. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSibley Road (east)
CrossesLetts Creek
LocationSylvan Twp Sec 2
RouteCounty Highway 0
CountyWashtenaw County
StateMichigan
Coordinates42.32425, -84.03611
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating21.8 US tons
Inventory rating13.2 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2014)
Projected traffic230 by 2034
Trucks0%
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 Sibley Road (east) over Letts Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Sibley Road (east) over Letts Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Sibley Road (east) over Letts Creek carry?

About 200 vehicles per day (2014 count).

How long is Sibley Road (east) over Letts Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.8 m).

Who owns Sibley Road (east) over Letts Creek?

It is owned by the County Highway Agency.