US Bridges

County RD 248G over Blackmoor/ Larson Creek

Fair

Coos County, Oregon · 005 Mile North Deans Mtrd · Structure no. 11C42D006100010

Built
1981
44 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
16
2020 count
Owner
County
County Highway Agency

About this bridge

County RD 248G over Blackmoor/ Larson Creek is a prestressed concrete slab carrying County RD 248G over Blackmoor/ Larson Creek in Coos County, Oregon. It was built in 1981, so it is 44 years old, younger than the Oregon average of 49.9 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 16 vehicles a day, roughly 1% of them trucks, projected to reach 18 by 2025. The structure is 26 ft (7.9 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty RD 248G
CrossesBlackmoor/ Larson Creek
Location005 Mile North Deans Mtrd
RouteCounty Highway C248G
CountyCoos County
StateOregon
Coordinates43.48077, -124.13907
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width12 ft (3.7 m)
Roadway width10 ft (3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2020)
Projected traffic18 by 2025
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$133,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 248G over Blackmoor/ Larson Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is County RD 248G over Blackmoor/ Larson Creek 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 September 2024.

How much traffic does County RD 248G over Blackmoor/ Larson Creek carry?

About 16 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is County RD 248G over Blackmoor/ Larson Creek?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 12 ft wide.

Who owns County RD 248G over Blackmoor/ Larson Creek?

It is owned by the County Highway Agency.