US Bridges

County RD 3620 over Br of Dry Fk CR

PoorPosted for load

Phelps County, Missouri · S 22 T 38 N R 6 W · Structure no. 16647

Built
1900
125 years old
Condition
Poor
inspected November 2023
Type
Slab
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 3620 over Br of Dry Fk CR is a concrete continuous slab carrying County RD 3620 over Br of Dry Fk CR in Phelps County, Missouri. It was built in 1900, so it is 125 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 4 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 130 by 2044. The structure is 33 ft (10.1 m) long and 21 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesCounty RD 3620
CrossesBr of Dry Fk CR
LocationS 22 T 38 N R 6 W
RouteCounty Highway 128
CountyPhelps County
StateMissouri
Coordinates37.9924, -91.58
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating16.9 US tons
Inventory rating9.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width21 ft (6.5 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic130 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$311,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 3620 over Br of Dry Fk CR built?

It was built in 1900, making it 125 years old in 2025.

What condition is County RD 3620 over Br of Dry Fk CR 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 November 2023.

How much traffic does County RD 3620 over Br of Dry Fk CR carry?

About 100 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 3620 over Br of Dry Fk CR?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m) and a deck 21 ft wide.

Who owns County RD 3620 over Br of Dry Fk CR?

It is owned by the County Highway Agency.