US Bridges

Csah 21 over Elm Creek

PoorPosted for load

Martin County, Minnesota · 1.1 MI S of JCT Csah 38 · Structure no. 89354

Built
1953
72 years old
Condition
Poor
inspected October 2024
Type
Slab
Wood or Timber
Length
66 ft
3 main spans
Daily traffic
70
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Elm Creek is a wood or timber slab carrying Csah 21 over Elm Creek in Martin County, Minnesota. It was built in 1953, so it is 72 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 70 vehicles a day, projected to reach 90 by 2038. The structure is 66 ft (20.1 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCsah 21
CrossesElm Creek
Location1.1 MI S of JCT Csah 38
RouteCounty Highway 21
Coordinates43.72008, -94.67471
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.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.6 US tons
Inventory rating9 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 15
Structure length66 ft (20.1 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2018)
Projected traffic90 by 2038
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$189 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 21 over Elm Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is Csah 21 over Elm Creek 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 21 over Elm Creek carry?

About 70 vehicles per day (2018 count).

How long is Csah 21 over Elm Creek?

The structure is 66 ft (20.1 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns Csah 21 over Elm Creek?

It is owned by the County Highway Agency.