US Bridges

Tiller-Trail HWY#1 over Diamond Creek

Good

Douglas County, Oregon · 7.3 MI SE of Drew Po · Structure no. 20502 0001 3881

Built
2009
16 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
277 ft
2 main spans
Daily traffic
546
2020 count
Owner
County
County Highway Agency

About this bridge

Tiller-Trail HWY#1 over Diamond Creek is a steel continuous stringer/multi-beam or girder carrying Tiller-Trail HWY#1 over Diamond Creek in Douglas County, Oregon. It was built in 2009, so it is 16 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 546 vehicles a day, roughly 15% of them trucks, projected to reach 606 by 2025. The structure is 277 ft (84.4 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesTiller-Trail HWY#1
CrossesDiamond Creek
Location7.3 MI SE of Drew Po
RouteCounty Highway 0A410
CountyDouglas County
StateOregon
Coordinates42.80875, -122.87181
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length277 ft (84.4 m)
Longest span135 ft (41.1 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic546 (2020)
Projected traffic606 by 2025
Trucks15%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Tiller-Trail HWY#1 over Diamond Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is Tiller-Trail HWY#1 over Diamond Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Tiller-Trail HWY#1 over Diamond Creek carry?

About 546 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Tiller-Trail HWY#1 over Diamond Creek?

The structure is 277 ft (84.4 m) long with a longest span of 135 ft (41.1 m) and a deck 42 ft wide.

Who owns Tiller-Trail HWY#1 over Diamond Creek?

It is owned by the County Highway Agency.