US Bridges

Swinging Br RD over Grand Auglaize

PoorClosed to traffic

Miller County, Missouri · S 36 T 39 N R 15 W · Structure no. 20779

Built
1920
105 years old
Condition
Poor
inspected January 2021
Type
Suspension
Steel Continuous
Length
500 ft
2 main spans
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Swinging Br RD over Grand Auglaize is a steel continuous suspension carrying Swinging Br RD over Grand Auglaize in Miller County, Missouri. It was built in 1920, so it is 105 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 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: closed to all traffic.

It carries about 250 vehicles a day, roughly 10% of them trucks, projected to reach 425 by 2043. The structure is 500 ft (152.4 m) long and 14 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesSwinging Br RD
CrossesGrand Auglaize
LocationS 36 T 39 N R 15 W
RouteCounty Highway 274
Coordinates38.07708, -92.52679
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
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 inspectionJanuary 2021
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeSuspension
MaterialSteel Continuous
DeckWood or timber
Main spans2
Design loadOther
Structure length500 ft (152.4 m)
Longest span414 ft (126.2 m)
Deck width14 ft (4.4 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck13 ft (4.1 m)

Traffic and service

Average daily traffic250 (2023)
Projected traffic425 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Swinging Br RD over Grand Auglaize built?

It was built in 1920, making it 105 years old in 2025.

What condition is Swinging Br RD over Grand Auglaize 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 January 2021.

How much traffic does Swinging Br RD over Grand Auglaize carry?

About 250 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Swinging Br RD over Grand Auglaize?

The structure is 500 ft (152.4 m) long with a longest span of 414 ft (126.2 m) and a deck 14 ft wide.

Who owns Swinging Br RD over Grand Auglaize?

It is owned by the County Highway Agency.