US Bridges

SR 21 over San Poil R

Poor

Ferry County, Washington · 24.2 N Lincoln CO · Structure no. 0001513A0000000

Built
1931
94 years old
Condition
Poor
inspected September 2023
Type
Tee Beam
Concrete
Length
46 ft
1 main span
Daily traffic
705
2023 count
Owner
State
State Highway Agency

About this bridge

SR 21 over San Poil R is a concrete tee beam carrying SR 21 over San Poil R in Ferry County, Washington. It was built in 1931, so it is 94 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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.

It carries about 705 vehicles a day, roughly 14% of them trucks, projected to reach 980 by 2039. The structure is 46 ft (14 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 21
CrossesSan Poil R
Location24.2 N Lincoln CO
RouteState Highway 21
CountyFerry County
StateWashington
Coordinates48.26843, -118.70167
Functional classRural Major Collector

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length46 ft (14 m)
Longest span44 ft (13.4 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic705 (2023)
Projected traffic980 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$612,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 21 over San Poil R built?

It was built in 1931, making it 94 years old in 2025.

What condition is SR 21 over San Poil R 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 September 2023.

How much traffic does SR 21 over San Poil R carry?

About 705 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 21 over San Poil R?

The structure is 46 ft (14 m) long with a longest span of 44 ft (13.4 m) and a deck 27 ft wide.

Who owns SR 21 over San Poil R?

It is owned by the State Highway Agency.