US Bridges

Old RTE 21 over Darr Valley

Fair

Reynolds County, Missouri · S 32 T 30 N R 1 E · Structure no. 16651

Built
1928
97 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
133 ft
6 main spans
Daily traffic
400
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Old RTE 21 over Darr Valley is a concrete slab carrying Old RTE 21 over Darr Valley in Reynolds County, Missouri. It was built in 1928, so it is 97 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 6 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 400 vehicles a day, roughly 10% of them trucks, projected to reach 480 by 2044. The structure is 133 ft (40.5 m) long and 23 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesOld RTE 21
CrossesDarr Valley
LocationS 32 T 30 N R 1 E
RouteCity Street 0
CountyReynolds County
StateMissouri
Coordinates37.2407, -90.9689
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 alignment7: Better than present minimum criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadOther
Structure length133 ft (40.5 m)
Longest span21 ft (6.5 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2024)
Projected traffic480 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old RTE 21 over Darr Valley built?

It was built in 1928, making it 97 years old in 2025.

What condition is Old RTE 21 over Darr Valley 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 January 2024.

How much traffic does Old RTE 21 over Darr Valley carry?

About 400 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Old RTE 21 over Darr Valley?

The structure is 133 ft (40.5 m) long with a longest span of 21 ft (6.5 m) and a deck 23 ft wide.

Who owns Old RTE 21 over Darr Valley?

It is owned by the City or Municipal Highway Agency.