US Bridges

Old No 7 over Silver Fk CR

Fair

Boone County, Missouri · S 26 T 50 N R 13 W · Structure no. 13546

Built
1976
49 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Old No 7 over Silver Fk CR is a steel stringer/multi-beam or girder carrying Old No 7 over Silver Fk CR in Boone County, Missouri. It was built in 1976, so it is 49 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 250 vehicles a day, roughly 10% of them trucks, projected to reach 475 by 2043. The structure is 78 ft (23.8 m) long and 21 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesOld No 7
CrossesSilver Fk CR
LocationS 26 T 50 N R 13 W
RouteCounty Highway 41
CountyBoone County
StateMissouri
Coordinates39.10015, -92.35772
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

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.
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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.5 US tons
Inventory rating34.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length78 ft (23.8 m)
Longest span75 ft (22.9 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic475 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Old No 7 over Silver Fk CR built?

It was built in 1976, making it 49 years old in 2025.

What condition is Old No 7 over Silver Fk CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does Old No 7 over Silver Fk CR carry?

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

How long is Old No 7 over Silver Fk CR?

The structure is 78 ft (23.8 m) long with a longest span of 75 ft (22.9 m) and a deck 21 ft wide.

Who owns Old No 7 over Silver Fk CR?

It is owned by the County Highway Agency.