US Bridges

T 30 over Cottonwood River

GoodPosted for load

Lyon County, Minnesota · 0.2 MI W of JCT Csah 9 · Structure no. 42528

Built
1978
47 years old
Condition
Good
inspected October 2023
Type
Slab
Wood or Timber
Length
78 ft
3 main spans
Daily traffic
35
2014 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 30 over Cottonwood River is a wood or timber slab carrying T 30 over Cottonwood River in Lyon County, Minnesota. It was built in 1978, so it is 47 years old, older than the Minnesota average of 38.5 years.

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

It carries about 35 vehicles a day, projected to reach 35 by 2039. The structure is 78 ft (23.8 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesT 30
CrossesCottonwood River
Location0.2 MI W of JCT Csah 9
RouteCounty Highway 30
Coordinates44.29759, -95.69995
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.9 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span26 ft (7.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2014)
Projected traffic35 by 2039
Trucks—
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

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 T 30 over Cottonwood River built?

It was built in 1978, making it 47 years old in 2025.

What condition is T 30 over Cottonwood River 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 October 2023.

How much traffic does T 30 over Cottonwood River carry?

About 35 vehicles per day (2014 count).

How long is T 30 over Cottonwood River?

The structure is 78 ft (23.8 m) long with a longest span of 26 ft (7.9 m) and a deck 26 ft wide.

Who owns T 30 over Cottonwood River?

It is owned by the Town or Township Highway Agency.