US Bridges

Csah 28 over Madison Lk Outlet

Fair

Blue Earth County, Minnesota · 0.4 MI N of JCT Csah 23 · Structure no. 07515

Built
1966
59 years old
Condition
Fair
inspected September 2024
Type
Channel Beam
Prestressed Concrete
Length
82 ft
3 main spans
Daily traffic
661
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 28 over Madison Lk Outlet is a prestressed concrete channel beam carrying Csah 28 over Madison Lk Outlet in Blue Earth County, Minnesota. It was built in 1966, so it is 59 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 661 vehicles a day, roughly 4% of them trucks, projected to reach 790 by 2042. The structure is 82 ft (25.1 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCsah 28
CrossesMadison Lk Outlet
Location0.4 MI N of JCT Csah 23
RouteCounty Highway 28
CountyBlue Earth County
StateMinnesota
Coordinates44.12909, -93.85873
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating29.9 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length82 ft (25.1 m)
Longest span31 ft (9.5 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic661 (2022)
Projected traffic790 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Csah 28 over Madison Lk Outlet built?

It was built in 1966, making it 59 years old in 2025.

What condition is Csah 28 over Madison Lk Outlet in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Csah 28 over Madison Lk Outlet carry?

About 661 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Csah 28 over Madison Lk Outlet?

The structure is 82 ft (25.1 m) long with a longest span of 31 ft (9.5 m) and a deck 32 ft wide.

Who owns Csah 28 over Madison Lk Outlet?

It is owned by the County Highway Agency.