US Bridges

19 1/2 Mile Road over State Ditch

PoorPosted for load

Calhoun County, Michigan · 7 MI N of Marshall · Structure no. 000000000001368

Built
1974
51 years old
Condition
Poor
inspected September 2024
Type
Slab
Wood or Timber
Length
48 ft
2 main spans
Daily traffic
147
1994 count
Owner
County
County Highway Agency

About this bridge

19 1/2 Mile Road over State Ditch is a wood or timber slab carrying 19 1/2 Mile Road over State Ditch in Calhoun County, Michigan. It was built in 1974, so it is 51 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. Its operating status is: posted for load restriction.

It carries about 147 vehicles a day, roughly 5% of them trucks, projected to reach 274 by 2024. The structure is 48 ft (14.6 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries19 1/2 Mile Road
CrossesState Ditch
Location7 MI N of Marshall
RouteCounty Highway 0
CountyCalhoun County
StateMichigan
Coordinates42.37367, -84.91734
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length48 ft (14.6 m)
Longest span24 ft (7.3 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic147 (1994)
Projected traffic274 by 2024
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 19 1/2 Mile Road over State Ditch built?

It was built in 1974, making it 51 years old in 2025.

What condition is 19 1/2 Mile Road over State Ditch 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 19 1/2 Mile Road over State Ditch carry?

About 147 vehicles per day (1994 count), of which roughly 5% are trucks.

How long is 19 1/2 Mile Road over State Ditch?

The structure is 48 ft (14.6 m) long with a longest span of 24 ft (7.3 m) and a deck 30 ft wide.

Who owns 19 1/2 Mile Road over State Ditch?

It is owned by the County Highway Agency.