County profile · official public datasets

Tillamook County, OR

225 public highway bridges tracked in the FHWA National Bridge Inventory: 35.6% rated Good, 59.6% Fair, 4.9% Poor.

225
Public bridges
35.6%
Good condition
4.9%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Tillamook County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

24th
of 36 on Poor share
4.9%
Poor-condition share
225
public highway bridges
1978
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Tillamook County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Tillamook County ranks #24 of 36 Oregon counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.9%). Tillamook County, Oregon contains 225 public highway bridges. Roughly 35.6% are rated “Good,” 59.6% “Fair,” and 4.9% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

225

Public highway bridges in Tillamook County

Good condition

35.6%

80 of 225 rated 7-9

Fair condition

59.6%

134 of 225 rated 5-6

Poor condition

4.9%

11 of 225 rated 4 or below

In-state Poor-share rank

#24 of 36

Among Oregon counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 225 NBI-tracked bridges by lowest applicable component rating.

Good
35.6% (80)
Fair
59.6% (134)
Poor
4.9% (11)

Tillamook County's Poor-condition bridges carry 19,439 vehicle crossings a day

That is 4.1% of the county's reported daily bridge traffic on 4.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,767 crossings a day against 1,599 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 225 of 225 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

45.3% of Tillamook County's bridges have passed the 50-year mark

102 of the 225 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 35.6% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 55.1% of the county's Poor-condition bridge traffic

US101 (HWY 9) over Kilchis R. & Possetti Rd, built 1952, carries 10,718 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 19,439 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Tillamook County's bridges were built

225 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 29 of the county's bridges still in the inventory were built, which is 12.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1978) matches the Oregon average (1975).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Tillamook County compares with Oregon's closest counties by inventory size

The 5 Oregon counties nearest Tillamook County in number of bridges, with their condition splits. Its 4.9% Poor share is the 3rd-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1975 is in line with the group.

Showing the 5 closest of 35 Oregon counties eligible for comparison.

Bridge inventory size and condition shares for Tillamook County and the 5 Oregon counties closest to it in inventory size
County Bridges Poor
Coos County 254 3.1%
Klamath County 248 5.2%
Josephine County 226 2.7%
Tillamook County (this page) 225 4.9%
Benton County 190 7.4%
Lincoln County 190 7.4%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Tillamook County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Tillamook County, both outside Oregon so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OR (225 bridges here).

Similar average build year

Nearest mean year-built outside OR (1978 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 225 Good 80 Fair 134 Poor 11

All bridges (225)

KANSAS CREEK ROAD

Good

Over: WILSON RIVER

10.0 MI EAST TILLAMOOK, Tillamook, OR

Built 2006 Load: 54.4 t ADT: 124

TRASK RIVER ROAD

Good

Over: SO FORK TRASK RIVER

12.0 MI E OF TILLAMOOK, Tillamook, OR

Built 2019 Load: 54.4 t ADT: 154

TILLAMOOK RIVER RD

Good

Over: TRASK RIVER OVERFLOW

002 MI SOUTH TILLAMOOK, Tillamook, OR

Built 1997 Load: 55.1 t ADT: 2,652

EAST BEAVER CR RD

Good

Over: EAST BEAVER CREEK

020 MI EAST OF HEMLOCK, Tillamook, OR

Built 2020 Load: 55.1 t ADT: 212

BEWLEY CR ROAD

Good

Over: TILLAMOOK RIVER

030 MI SOUTH OF TILLAMOOK, Tillamook, OR

Built 1999 Load: 57.2 t ADT: 1,273

BEWLEY CREEK ROAD

Good

Over: BEWLEY CREEK

015 MI SE TILLAMOOK AIRPT, Tillamook, OR

Built 2006 Load: 58.1 t ADT: 371

MOSS CREEK ROAD

Good

Over: MOSS CREEK

009 MI SE JCT MIAMI/MOSS, Tillamook, OR

Built 2021 Load: 59.0 t ADT: 20

Jenck Rd

Good

Over: Clear Creek

Jenck Rd, Tillamook, OR

Built 2020 Load: 59.9 t ADT: 1,000

ROAD

Good

Over: NESTUCCA RIVER

0.1 MI FROM JCT CO RD 858, Tillamook, OR

Built 1983 Load: 60.8 t ADT: 5

03 S 06 W 15.03:

Good

Over: Walker Creek

31 miles east of Hwy 101, Tillamook, OR

Built 2013 Load: 62.5 t ADT: 10

SOUTH PRAIRIE ROAD

Good

Over: FAWCETT CREEK

MP 2.65 SOUTH PRAIRIE RD, Tillamook, OR

Built 2010 Load: 72.6 t ADT: 1,697

03 S 06 W 13.00:

Good

Over: Fan Creek

23.0 Miles E of Hwy 101 (, Tillamook, OR

Built 2012 Load: 73.5 t ADT: 50

03 S 06 W 13.00:

Good

Over: Cedar Creek

7.16 mi on NW Nestucca Ac, Tillamook, OR

Built 2021 Load: 97.2 t ADT: 100

03 S 06 W 13.00:

Good

Over: Ginger Creek

7.90 mi on NW Nestucca Ac, Tillamook, OR

Built 2021 Load: 97.2 t ADT: 100

BIG TROUT ROAD

Poor

Over: THREE RIVERS

030MI SE OF HEBO, Tillamook, OR

Built 1994 Load: 2.9 t ADT: 15

BLUM LANE

Poor

Over: DOUGHERTY SLOUGH

015 NE OF TILLAMOOK, Tillamook, OR

Built 1989 Load: 6.5 t ADT: 15

LEARNED ROAD

Poor

Over: SLOUGH

1.7 MI W OF CLOVERDALE, Tillamook, OR

Built 1964 Load: 12.6 t ADT: 74

OR 22 (Hwy 32)

Poor

Over: Louie Creek

107 MI SE HEBO, Tillamook, OR

Built 1962 Load: 13.9 t ADT: 2,358

US101 (Hwy 9)

Poor

Over: West Beaver Creek

030 MI N BEAVER, Tillamook, OR

Built 1914 Load: 22.2 t ADT: 4,440

FOSS ROAD

Poor

Over: CRONIN CREEK

12.0 MI NE OF MOHLER, Tillamook, OR

Built 1984 Load: 26.6 t ADT: 92

GOODSPEED ROAD

Poor

Over: HALL SLOUGH

1.5 MI N.W.OF TILLAMOOK, Tillamook, OR

Built 1960 Load: 26.9 t ADT: 67

US101 (HWY 9)

Poor

Over: Kilchis R. & Possetti Rd

026 MI N TILLAMOOK, Tillamook, OR

Built 1952 Load: 30.8 t ADT: 10,718

SAND LAKE ROAD

Poor

Over: SAND CREEK

2.0 MI NORTH SANDLAKE, Tillamook, OR

Built 1973 Load: 36.0 t ADT: 1,485

RIDGE VIEW WAY

Poor

Over: FOLEY CREEK

4.5 SOUTH OF MOHLER, Tillamook, OR

Built 1972 Load: 38.6 t ADT: 69

NEW MIAMI RIVER RD

Poor

Over: MIAMI RV

4.0 MI SOUTH OF MOHLER, Tillamook, OR

Built 1978 Load: 39.5 t ADT: 106

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.