US Bridges

Csah 8 over Tuttle Lake Outlet

PoorPosted for load

Martin County, Minnesota · 1.5 MI W of JCT CR 133 · Structure no. 46501

Built
1959
66 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
90 ft
3 main spans
Daily traffic
480
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 8 over Tuttle Lake Outlet is a wood or timber stringer/multi-beam or girder carrying Csah 8 over Tuttle Lake Outlet in Martin County, Minnesota. It was built in 1959, so it is 66 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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 480 vehicles a day, projected to reach 445 by 2038. The structure is 90 ft (27.3 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCsah 8
CrossesTuttle Lake Outlet
Location1.5 MI W of JCT CR 133
RouteCounty Highway 8
CountyMartin County
StateMinnesota
Coordinates43.52892, -94.57399
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; extensive scour has occurred
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating10.8 US tons
Inventory rating7.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length90 ft (27.3 m)
Longest span45 ft (13.7 m)
Deck width31 ft (9.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2018)
Projected traffic445 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$327 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 8 over Tuttle Lake Outlet built?

It was built in 1959, making it 66 years old in 2025.

What condition is Csah 8 over Tuttle Lake Outlet 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 Csah 8 over Tuttle Lake Outlet carry?

About 480 vehicles per day (2018 count).

How long is Csah 8 over Tuttle Lake Outlet?

The structure is 90 ft (27.3 m) long with a longest span of 45 ft (13.7 m) and a deck 31 ft wide.

Who owns Csah 8 over Tuttle Lake Outlet?

It is owned by the County Highway Agency.