County profile · official public datasets

Weld County, CO

614 public highway bridges tracked in the FHWA National Bridge Inventory: 36.8% rated Good, 58.5% Fair, 4.7% Poor.

614
Public bridges: 36.8%
Good condition: 4.7%
Poor condition

The verdict

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

Weld County posts a better-than-median Poor-condition share among rated counties in the state across large county bridge inventory.

Top 50%
lowest Poor share in state: 4.7%
Poor-condition share: 614
public highway bridges: 1986
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.

Weld County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Weld County ranks #32 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Weld County, Colorado contains 614 public highway bridges. Roughly 36.8% are rated “Good,” 58.5% “Fair,” and 4.7% “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

614

Public highway bridges in Weld County

Good condition

36.8%

226 of 614 rated 7-9

Fair condition

58.5%

359 of 614 rated 5-6

Poor condition

4.7%

29 of 614 rated 4 or below

In-state Poor-share rank

#32 of 64

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

Condition distribution

Share of 614 NBI-tracked bridges by lowest applicable component rating.

Good

36.8% (226)

Fair

58.5% (359)

Poor

4.7% (29)

Weld County's Poor-condition bridges carry 120,310 vehicle crossings a day

That is 3.1% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 4,149 crossings a day against 8,457 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 614 of 614 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

30.5% of Weld County's bridges have passed the 50-year mark

187 of the 614 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 36.8% 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 13.7% of the county's Poor-condition bridge traffic

US 34 ML WBND over US 85 BUS RT, built 1962, carries 16,500 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 29-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 120,310 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1930s

9
1940s

5
1950s

39
1960s

101
1970s

53
1980s

96
1990s

135
2000s

98
2010s

51
2020s

27

What this shows Construction peaked in the 1990s, when 135 of the county's bridges still in the inventory were built, which is 22% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1986) matches the Colorado average (1982).

How Weld County compares with Colorado's closest counties by inventory size

The 5 Colorado counties nearest Weld County in number of bridges, with their condition splits. Its 4.7% Poor share is the 4th-lowest of these 6. Its average build year of 1986 against a peer-group mean of 1987 is in line with the group.

Showing the 5 closest of 63 Colorado counties eligible for comparison.

Bridge inventory size and condition shares for Weld County and the 5 Colorado counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
El Paso County	686	31.3%	65.5%	3.2%	1984
Weld County (this page)	614	36.8%	58.5%	4.7%	1986
Larimer County	559	49%	49%	2%	1987
Adams County	535	43.9%	49.2%	6.9%	1990
Jefferson County	464	33.8%	59.9%	6.3%	1984
Denver County	458	41.9%	56.3%	1.7%	1991

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

Similar inventory size

Nearest county inventories outside CO (614 bridges here).

Monroe County, NY · 615 bridges
Allen County, IN · 613 bridges
Mobile County, AL · 612 bridges
Contra Costa County, CA · 618 bridges

Similar average build year

Nearest mean year-built outside CO (1986 here).

El Paso County, TX · avg 1986 · 783 bridges
Caddo County, LA · avg 1986 · 682 bridges
Polk County, IA · avg 1986 · 545 bridges
Canadian County, OK · avg 1986 · 493 bridges

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

All 614 Good 226 Fair 359 Poor 29

Fair-condition bridges (359)

Sort:

Weld County Bridge Snapshot

Condition distribution

Weld County's Poor-condition bridges carry 120,310 vehicle crossings a day

30.5% of Weld County's bridges have passed the 50-year mark

One structure carries 13.7% of the county's Poor-condition bridge traffic

How Weld County compares with Colorado'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 (359)

County Road 6

County Road 33

County Road 39

I 25 ML NBND

I 25 ML SBND

CR 13 and CR 18

County Road 4

County Road 22

I 25 ML SBND

I 25 ML NBND

I 25 ML NBND

I 25 ML SBND

County Road 87

I 25 ML NBND

I 25 ML SBND

County Road 25

County Road 53

County Road 54

County Road 31

County Road 50

SH 60 ML

SH 257 ML

County Road 6

County Road 37

SH 392 ML

14th Street

COUNTY ROAD 34

County Road 33

County Road 84

US 34 ML WBND

County Road 47

County Road 136

County Road 78

County Road 90

County Road 19.5

County Road 47

I 25 ML SBND

I 25 ML

County Road 48

County Road 45

County Road 56

SH 392 ML

US 85 ML SBND

I 76 ML

Cheeseman Street

CR 1 (Co Line Rd)

County Road 396

County Road 33

49th Street (CR52)

4th Street

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