US Bridges

SW1151 over Montrose Lk

Good

Henry County, Missouri · S 36 T 41 N R 28 W · Structure no. 20932

Built
1996
29 years old, rebuilt 2015
Condition
Good
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
321 ft
10 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

SW1151 over Montrose Lk is a prestressed concrete tee beam carrying SW1151 over Montrose Lk in Henry County, Missouri. It was built in 1996 and reconstructed in 2015, so it is 29 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 140 by 2043. The structure is 321 ft (97.8 m) long and 23 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSW1151
CrossesMontrose Lk
LocationS 36 T 41 N R 28 W
RouteCounty Highway 280
Coordinates38.30557, -93.96975
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans10 (+1 approach)
Design loadHS 20
Structure length321 ft (97.8 m)
Longest span30 ft (9.1 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic140 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 SW1151 over Montrose Lk built?

It was built in 1996, making it 29 years old in 2025. It was reconstructed in 2015.

What condition is SW1151 over Montrose Lk in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does SW1151 over Montrose Lk carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SW1151 over Montrose Lk?

The structure is 321 ft (97.8 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns SW1151 over Montrose Lk?

It is owned by the County Highway Agency.