County profile · official public datasets

Lane County, OR

1,010 public highway bridges tracked in the FHWA National Bridge Inventory: 33% rated Good, 65.5% Fair, 1.5% Poor.

1,010
Public bridges: 33%
Good condition: 1.5%
Poor condition

The verdict

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

Lane County posts a top-quartile lowest Poor-condition share among rated counties in the state across large county bridge inventory.

Top 17%
lowest Poor share in state: 1.5%
Poor-condition share: 1,010
public highway bridges: 1975
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.

Lane County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lane County ranks #6 of 36 Oregon counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.5%). Lane County, Oregon contains 1,010 public highway bridges. Roughly 33% are rated “Good,” 65.5% “Fair,” and 1.5% “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

1,010

Public highway bridges in Lane County

Good condition

33%

333 of 1,010 rated 7-9

Fair condition

65.5%

662 of 1,010 rated 5-6

Poor condition

1.5%

15 of 1,010 rated 4 or below

In-state Poor-share rank

#6 of 36

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

Condition distribution

Share of 1,010 NBI-tracked bridges by lowest applicable component rating.

Good

33% (333)

Fair

65.5% (662)

Poor

1.5% (15)

Lane County's Poor-condition bridges carry 47,802 vehicle crossings a day

That is 1% of the county's reported daily bridge traffic on 1.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,187 crossings a day against 2,747 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 1,008 of 1,010 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48.2% of Lane County's bridges have passed the 50-year mark

487 of the 1,010 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 33% 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 37.4% of the county's Poor-condition bridge traffic

GOODPASTURE IS RD over HWY 132, built 1965, carries 17,868 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 15-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 47,802 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

13
1930s

31
1940s

16
1950s

133
1960s

223
1970s

212
1980s

170
1990s

86
2000s

78
2010s

34
2020s

13

What this shows Construction peaked in the 1960s, when 223 of the county's bridges still in the inventory were built, which is 22.1% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1975) matches the Oregon average (1975).

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

The 5 Oregon counties nearest Lane County in number of bridges, with their condition splits. Its 1.5% Poor share is the 1st-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1972 is in line with the group.

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

Bridge inventory size and condition shares for Lane County and the 5 Oregon counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Lane County (this page)	1,010	33%	65.5%	1.5%	1975
Douglas County	699	34%	62.8%	3.1%	1973
Linn County	566	20.8%	61.5%	17.7%	1971
Multnomah County	473	11.8%	85.2%	3%	1967
Jackson County	401	34.2%	64.3%	1.5%	1976
Marion County	373	21.2%	74.5%	4.3%	1971

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 Lane 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 Lane County, both outside Oregon so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OR (1,010 bridges here).

Worcester County, MA · 1,014 bridges
Wayne County, MI · 1,026 bridges
Denton County, TX · 991 bridges
Santa Clara County, CA · 964 bridges

Similar average build year

Nearest mean year-built outside OR (1975 here).

San Bernardino County, CA · avg 1975 · 1,422 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges
Monroe County, NY · avg 1975 · 615 bridges

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

All 1,010 Good 333 Fair 662 Poor 15

Fair-condition bridges (662)

Sort:

Lane County Bridge Snapshot

Condition distribution

Lane County's Poor-condition bridges carry 47,802 vehicle crossings a day

48.2% of Lane County's bridges have passed the 50-year mark

One structure carries 37.4% of the county's Poor-condition bridge traffic

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

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (662)

LADUKE ROAD

OR 58 (HWY 018)

I-5 (HWY 001) SB

DAY ISLAND ROAD

ROAD

SPENCER CR RD

CHEZEM ROAD

SEAVEY LOOP RD

ROAD

BENNETT CREEK ROAD

WOLF CREEK ROAD

TEMPLETON ROAD

COX BUTTE ROAD

INDIAN CR RD

HWY 69

UPPER DEADWD CR

JOHNSON RD

BRICE CR RD

POWELL ROAD

HWY 225

HWY 222

MAPLE DRIVE

HILL ROAD

JASPER-LOWELL RD

CANARY ROAD

TWIN FIRS LANE

MOSBY CR RD

LYNX HOLLOW ROAD

SIEGMAN SMYTH ROAD

JAEGER LANE

PITNEY LANE NORTH

GOLDSON ROAD

HAMM ROAD

SUMMERVILLE ROAD

TIERNAN ROAD EAST

N FORK SIUSLAW RD

SOUTH SLOUGH ROAD

ENTERPRISE ROAD

KIMBALL RD

BROWN ROAD

SPENCER CR RD

ROAD

FAIRGROUNDS ROAD

I-5 (HWY 001) SB

MEADOWVIEW RD WEST

FERGUSON ROAD

TOFTDAHL LANE N

SUMICH ROAD

KNIGHT ROAD

N FORK SIUSLAW RD

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