US Bridges

N. Frk. Tieton RD over Miriam Creek

Good

Yakima County, Washington · W of Naches HWY 12 1200 · Structure no. 061708000029745

Built
2017
8 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
50
2017 count
Owner
Federal
U.S. Forest Service

About this bridge

N. Frk. Tieton RD over Miriam Creek is a steel stringer/multi-beam or girder carrying N. Frk. Tieton RD over Miriam Creek in Yakima County, Washington. It was built in 2017, so it is 8 years old, younger than the Washington average of 49.8 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 81 ft (24.6 m) long and 18 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesN. Frk. Tieton RD
CrossesMiriam Creek
LocationW of Naches HWY 12 1200
RouteFederal Lands Road 12070
CountyYakima County
StateWashington
Coordinates46.60234, -121.3403
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.1 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length81 ft (24.6 m)
Longest span79 ft (24.1 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2017)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N. Frk. Tieton RD over Miriam Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is N. Frk. Tieton RD over Miriam 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 August 2023.

How much traffic does N. Frk. Tieton RD over Miriam Creek carry?

About 50 vehicles per day (2017 count).

How long is N. Frk. Tieton RD over Miriam Creek?

The structure is 81 ft (24.6 m) long with a longest span of 79 ft (24.1 m) and a deck 18 ft wide.

Who owns N. Frk. Tieton RD over Miriam Creek?

It is owned by the U.S. Forest Service.