US Bridges

Saline-Milan Road over Koch Drain

Good

Washtenaw County, Michigan · York Twp Sec 6 · Structure no. 000000000011001

Built
2019
6 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
3,237
2019 count
Owner
County
County Highway Agency

About this bridge

Saline-Milan Road over Koch Drain is a concrete culvert carrying Saline-Milan Road over Koch Drain in Washtenaw County, Michigan. It was built in 2019, so it is 6 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,237 vehicles a day, roughly 5% of them trucks, projected to reach 3,577 by 2039. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSaline-Milan Road
CrossesKoch Drain
LocationYork Twp Sec 6
RouteCounty Highway 8169
CountyWashtenaw County
StateMichigan
Coordinates42.1557, -83.77449
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.5 US tons
Inventory rating57.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadGreater than HL 93
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,237 (2019)
Projected traffic3,577 by 2039
Trucks5%
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$130,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Saline-Milan Road over Koch Drain built?

It was built in 2019, making it 6 years old in 2025.

What condition is Saline-Milan Road over Koch Drain in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Saline-Milan Road over Koch Drain carry?

About 3,237 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Saline-Milan Road over Koch Drain?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m).

Who owns Saline-Milan Road over Koch Drain?

It is owned by the County Highway Agency.