US Bridges

Csah 13 over Estes Brook

Poor

Mille Lacs County, Minnesota · 0.4 MI E of JCT Csah 7 · Structure no. 48501

Built
1960
65 years old
Condition
Poor
inspected June 2024
Type
Channel Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
120
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 13 over Estes Brook is a prestressed concrete channel beam carrying Csah 13 over Estes Brook in Mille Lacs County, Minnesota. It was built in 1960, so it is 65 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.

It carries about 120 vehicles a day, projected to reach 100 by 2038. The structure is 25 ft (7.7 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCsah 13
CrossesEstes Brook
Location0.4 MI E of JCT Csah 7
RouteCounty Highway 13
Coordinates45.64373, -93.73077
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.9 US tons
Inventory rating45.4 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length25 ft (7.7 m)
Longest span23 ft (7 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2018)
Projected traffic100 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$181 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 13 over Estes Brook built?

It was built in 1960, making it 65 years old in 2025.

What condition is Csah 13 over Estes Brook 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 June 2024.

How much traffic does Csah 13 over Estes Brook carry?

About 120 vehicles per day (2018 count).

How long is Csah 13 over Estes Brook?

The structure is 25 ft (7.7 m) long with a longest span of 23 ft (7 m) and a deck 31 ft wide.

Who owns Csah 13 over Estes Brook?

It is owned by the County Highway Agency.