County profile · official public datasets

Adams County, CO

535 public highway bridges tracked in the FHWA National Bridge Inventory: 43.9% rated Good, 49.2% Fair, 6.9% Poor.

535
Public bridges
43.9%
Good condition
6.9%
Poor condition

The verdict

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

Adams County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

49th
of 64 on Poor share
6.9%
Poor-condition share
535
public highway bridges
1990
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.

Adams County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Adams County ranks #49 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.9%). Adams County, Colorado contains 535 public highway bridges. Roughly 43.9% are rated “Good,” 49.2% “Fair,” and 6.9% “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

535

Public highway bridges in Adams County

Good condition

43.9%

235 of 535 rated 7-9

Fair condition

49.2%

263 of 535 rated 5-6

Poor condition

6.9%

37 of 535 rated 4 or below

In-state Poor-share rank

#49 of 64

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

Condition distribution

Share of 535 NBI-tracked bridges by lowest applicable component rating.

Good
43.9% (235)
Fair
49.2% (263)
Poor
6.9% (37)

Adams County's Poor-condition bridges carry 578,957 vehicle crossings a day

That is 5.2% of the county's reported daily bridge traffic on 6.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 16,082 crossings a day against 21,840 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 531 of 535 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

21.3% of Adams County's bridges have passed the 50-year mark

114 of the 535 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 43.9% 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 8.4% of the county's Poor-condition bridge traffic

I 270 ML WBND over SOUTH PLATTE RIVER, built 1969, carries 48,500 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 37-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 578,957 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Adams County's bridges were built

535 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 152 of the county's bridges still in the inventory were built, which is 28.4% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1990, 8 years newer than the Colorado average of 1982.

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

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

The 5 Colorado counties nearest Adams County in number of bridges, with their condition splits. Its 6.9% Poor share is the 5th-lowest of these 6. Its average build year of 1990 against a peer-group mean of 1986 is in line with the group.

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

Bridge inventory size and condition shares for Adams County and the 5 Colorado counties closest to it in inventory size
County Bridges Poor
Weld County 614 4.7%
Larimer County 559 2%
Adams County (this page) 535 6.9%
Jefferson County 464 6.3%
Denver County 458 1.7%
Arapahoe County 391 7.2%

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

Similar inventory size

Nearest county inventories outside CO (535 bridges here).

Similar average build year

Nearest mean year-built outside CO (1990 here).

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

All 535 Good 235 Fair 263 Poor 37

Good-condition bridges (235)

PEORIA STREET

Good

Over: I 76 ML

2.7 MI NE OF JCT US 85, Adams, CO

Built 2013 Load: 45.4 t ADT: 3,541

SH 2 ML

Good

Over: OBRIAN CANAL

0.3 MI S. OF JCT I 76, Adams, CO

Built 1999 Load: 45.9 t ADT: 16,034

E-470 NB

Good

Over: Ramp E

20.88 MI FROM I25, Adams, CO

Built 2006 Load: 47.4 t ADT: 18,092

BISCAY STREET

Good

Over: Local Drainage

JUST N OF 104TH AVENUE, Adams, CO

Built 2008 Load: 47.6 t ADT: 10

E-470 SB

Good

Over: Ramp E

20.88 MI FROM I25, Adams, CO

Built 2006 Load: 47.7 t ADT: 17,985

FEDERAL PARKWAY

Good

Over: BIG DRY CREEK

.6 MI N OF 120TH AVE, Adams, CO

Built 2002 Load: 48.0 t ADT: 14,581

112TH AVENUE

Good

Over: FULTON DITCH

350 FT E OF BRIGHTON ROAD, Adams, CO

Built 2021 Load: 48.6 t ADT: 4,010

US 36 ML

Good

Over: LOWELL BLVD

0.5 MI W OF FEDERAL, Adams, CO

Built 2014 Load: 48.6 t ADT: 103,000

CAMERON DRIVE

Good

Over: OBRIAN CANAL

SE OF I-76/120TH INT., Adams, CO

Built 2001 Load: 48.8 t ADT: 151

120TH AVENUE

Good

Over: LOCAL DRAINAGE

0.8 MI EAST OF PICADILLY, Adams, CO

Built 1995 Load: 48.9 t ADT: 3,545

SH 265 ML

Good

Over: SAND CREEK

COMMERCE CITY, Adams, CO

Built 1999 Load: 49.6 t ADT: 6,500

US 287 ML

Good

Over: US 36 ML

FEDERAL @ US 36 IN WEST., Adams, CO

Built 2002 Load: 50.5 t ADT: 40,000

GUN CLUB RD/E470

Good

Over: I 70 ML

0.5 MI E OF JCT US 40, Adams, CO

Built 1973 Load: 50.8 t ADT: 17,744

NB E470 TO SBI25

Good

Over: I25 E470 ML RAMPS

46.36 MI FROM I25, Adams, CO

Built 2003 Load: 50.9 t ADT: 830

PENA BLVD SBND RMP

Good

Over: RMP TO I70 WB ML

PENA BLVD OVER AIRPORT RD, Adams, CO

Built 1993 Load: 51.5 t ADT: 33,000

72ND AVENUE

Good

Over: LITTLE DRY CREEK

72ND AND RALEIGH, Adams, CO

Built 2017 Load: 51.8 t ADT: 14,357

E-470 RAMP G

Good

Over: Relocated Third Creek

35.46 MI FROM I25, Adams, CO

Built 2001 Load: 53.1 t ADT: 2,700

AKRON STREET

Good

Over: TODD CREEK TRIBUTARY

0.1 MI SOUTH OF 152ND AVE, Adams, CO

Built 2001 Load: 54.4 t ADT: 52

SH 2 ML

Good

Over: US 6 ML

IN COMMERCE CITY, Adams, CO

Built 1987 Load: 55.9 t ADT: 6,100

17TH PLACE

Good

Over: I-225

0.3 MI N OF COLFAX AVE, Adams, CO

Built 2013 Load: 56.6 t ADT: 10,438

LOWELL BLVD

Good

Over: CLEAR CREEK

BETWEEN 55TH PL AND I76, Adams, CO

Built 2000 Load: 57.1 t ADT: 3,731

EB MONTVIEW BLVD

Good

Over: WESTERLY CREEK

0.26 MI E OF YOSEMITE ST., Adams, CO

Built 2014 Load: 58.3 t ADT: 10,147

80TH AVE

Good

Over: US 36 ML

IN WESTMINSTER, Adams, CO

Built 2010 Load: 58.6 t ADT: 15,264

US 36 ML

Good

Over: LOST CREEK

9 MI E OF JCT I 70, Adams, CO

Built 1983 Load: 63.8 t ADT: 1,900

US 287 ML

Good

Over: BIG DRY CREEK

120th AVE. W. of FEDERAL, Adams, CO

Built 1987 Load: 69.9 t ADT: 41,000

104TH AVE

Good

Over: I 25 ML

IN NORTHGLENN, Adams, CO

Built 2009 Load: 71.0 t ADT: 31,113

WASHINGTON STREET

Good

Over: LOCAL DRAINAGE

0.5 MI N OF 136TH AVE, Adams, CO

Built 2010 Load: 71.0 t ADT: 12,021

RIVERDALE ROAD

Good

Over: HALL STREAM

JUST N OF 104TH AVENUE, Adams, CO

Built 1993 Load: 75.6 t ADT: 6,933

OSAGE STREET

Good

Over: BNSF MAINLINE/LIGHT RAIL

W 62ND PKWY, Adams, CO

Built 2012 Load: 76.0 t ADT: 906

TOWER ROAD

Good

Over: SECOND CREEK

0.25 MI N OF 81ST AVE, Adams, CO

Built 2018 Load: 78.4 t ADT: 28,933

Peoria Street

Good

Over: Burlington Ditch

1.2 MI E JCT 85/112th AVE, Adams, CO

Built 2022 Load: 81.0 t ADT: 3,552

MCKAY ROAD

Good

Over: GRANGE HALL CREEK

.35 MI NORTH OF 104TH AVE, Adams, CO

Built 2005 Load: 85.9 t ADT: 14,424

US 287 ML

Good

Over: PEDESTRIAN UNDERPASS

3.95 MI N OF US 36, Adams, CO

Built 1999 Load: 90.5 t ADT: 27,000

144TH AVE

Good

Over: BIG DRY CREEK

0.4 MI E OF WASHINGTON ST, Adams, CO

Built 2021 Load: 91.4 t ADT: 12,054

FEDERAL BLVD

Good

Over: RANCH CREEK

N OF 120TH AVE ON FEDERAL, Adams, CO

Built 2002 Load: 99.9 t ADT: 10,952

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

Related

Browse all → | Rankings →
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.