US Bridges

Dexter-Chelsea RD over Letts Creek

PoorPosted for load

Washtenaw County, Michigan · Lima Twp Sec 8 · Structure no. 000000000010987

Built
1983
42 years old
Condition
Poor
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
3,320
2005 count
Owner
County
County Highway Agency

About this bridge

Dexter-Chelsea RD over Letts Creek is a prestressed concrete box beam or girders - multiple carrying Dexter-Chelsea RD over Letts Creek in Washtenaw County, Michigan. It was built in 1983, so it is 42 years old, younger 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 4 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 3,320 vehicles a day, roughly 9% of them trucks, projected to reach 5,996 by 2025. The structure is 62 ft (18.9 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesDexter-Chelsea RD
CrossesLetts Creek
LocationLima Twp Sec 8
RouteCounty Highway 8168
Coordinates42.32218, -83.97935
Functional classRural Major Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating31.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length62 ft (18.9 m)
Longest span62 ft (18.9 m)
Deck width37 ft (11.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,320 (2005)
Projected traffic5,996 by 2025
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$330,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Dexter-Chelsea RD over Letts Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is Dexter-Chelsea RD 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 July 2024.

How much traffic does Dexter-Chelsea RD over Letts Creek carry?

About 3,320 vehicles per day (2005 count), of which roughly 9% are trucks.

How long is Dexter-Chelsea RD over Letts Creek?

The structure is 62 ft (18.9 m) long with a longest span of 62 ft (18.9 m) and a deck 37 ft wide.

Who owns Dexter-Chelsea RD over Letts Creek?

It is owned by the County Highway Agency.