US Bridges

Thomson RD over Abandoned RR Row

Poor

Cass County, Michigan · 1.5 MI E of M-51 · Structure no. 000000000001451

Built
1919
106 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
169 ft
5 main spans
Daily traffic
30
2004 count
Owner
County
County Highway Agency

About this bridge

Thomson RD over Abandoned RR Row is a steel stringer/multi-beam or girder carrying Thomson RD over Abandoned RR Row in Cass County, Michigan. It was built in 1919, so it is 106 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 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.

It carries about 30 vehicles a day, projected to reach 45 by 2024. The structure is 169 ft (51.5 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesThomson RD
CrossesAbandoned RR Row
Location1.5 MI E of M-51
RouteCounty Highway 0
CountyCass County
StateMichigan
Coordinates41.8814, -86.19472
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating57.9 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length169 ft (51.5 m)
Longest span35 ft (10.6 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2004)
Projected traffic45 by 2024
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
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 statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Thomson RD over Abandoned RR Row built?

It was built in 1919, making it 106 years old in 2025.

What condition is Thomson RD over Abandoned RR Row 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 October 2024.

How much traffic does Thomson RD over Abandoned RR Row carry?

About 30 vehicles per day (2004 count).

How long is Thomson RD over Abandoned RR Row?

The structure is 169 ft (51.5 m) long with a longest span of 35 ft (10.6 m) and a deck 23 ft wide.

Who owns Thomson RD over Abandoned RR Row?

It is owned by the County Highway Agency.