US Bridges

Csah 9 over N Br Upper Iowa River

PoorPosted for load

Mower County, Minnesota · 0.1 MI S of JCT TH 56 · Structure no. 93079

Built
1974
51 years old
Condition
Poor
inspected August 2024
Type
Channel Beam
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
65
2012 count
Owner
County
County Highway Agency

About this bridge

Csah 9 over N Br Upper Iowa River is a prestressed concrete channel beam carrying Csah 9 over N Br Upper Iowa River in Mower County, Minnesota. It was built in 1974, so it is 51 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 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 65 vehicles a day, projected to reach 65 by 2039. The structure is 26 ft (7.8 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCsah 9
CrossesN Br Upper Iowa River
Location0.1 MI S of JCT TH 56
RouteCounty Highway 9
Coordinates43.55662, -92.62881
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.8 US tons
Inventory rating14.4 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.8 m)
Longest span23 ft (7 m)
Deck width35 ft (10.7 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2012)
Projected traffic65 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

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 9 over N Br Upper Iowa River built?

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

What condition is Csah 9 over N Br Upper Iowa River 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 August 2024.

How much traffic does Csah 9 over N Br Upper Iowa River carry?

About 65 vehicles per day (2012 count).

How long is Csah 9 over N Br Upper Iowa River?

The structure is 26 ft (7.8 m) long with a longest span of 23 ft (7 m) and a deck 35 ft wide.

Who owns Csah 9 over N Br Upper Iowa River?

It is owned by the County Highway Agency.