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)

130TH AVE

Good

Over: LOCAL DRAINAGE

0.2 MI E OF HOLLY ST, Adams, CO

Built 2006 Load: 32.7 t ADT: 1,942

144TH AVE

Good

Over: EAST FRONTAGE RD

0.1 MI E OF I-25, Adams, CO

Built 2006 Load: 32.7 t ADT: 23,906

152ND AVENUE

Good

Over: BIG DRY CREEK TRIBUTARY

0.3 MI EAST OF WASHINGTON, Adams, CO

Built 2000 Load: 32.7 t ADT: 5,431

GRANT STREET

Good

Over: LOCAL DRAINAGE

JUST N OF 140TH AVE, Adams, CO

Built 2018 Load: 32.7 t ADT: 4,074

QUEBEC ST

Good

Over: BRANTNER GULCH

0.5MI N OF 120TH AVE, Adams, CO

Built 2005 Load: 32.7 t ADT: 9,456

QUEBEC STREET

Good

Over: BRANTNER GULCH TRIB

.35 MI N OF 128TH AVE, Adams, CO

Built 2003 Load: 32.7 t ADT: 3,519

THORNTON PKWY

Good

Over: NIVER CREEK

.25 MI W OF I25, Adams, CO

Built 1990 Load: 32.7 t ADT: 20,525

VALENTIA ST

Good

Over: BRANTNER GULCH TRIB

0.20 MI N OF 128TH AVE, Adams, CO

Built 2006 Load: 32.7 t ADT: 329

WASHINGTON STREET

Good

Over: LOCAL DRAINAGE

0.3 MI N OF 144TH AVE, Adams, CO

Built 2018 Load: 32.7 t ADT: 8,317

TENNYSON ST

Good

Over: LITTLE DRY CREEK

N OF 72ND ON TENNYSON ST, Adams, CO

Built 1988 Load: 32.7 t ADT: 1,652

WINONA CT

Good

Over: LITTLE DRY CREEK

N OF 72ND AVE ON WINONA C, Adams, CO

Built 1988 Load: 32.7 t ADT: 2,512

BRADBURN BOULEVARD

Good

Over: LOCAL DRAINAGE

0.1 MI W OF PERRY ST, Adams, CO

Built 2003 Load: 32.7 t ADT: 2,603

WOLFF ST

Good

Over: COZY CORNER TRIBUTARY #5

0.25 MI E OF SHERIDAN BLV, Adams, CO

Built 2006 Load: 32.7 t ADT: 1,803

HURON ST

Good

Over: QUAIL CREEK

JUST N OF 134TH AVE, Adams, CO

Built 2006 Load: 32.7 t ADT: 11,623

HURON ST

Good

Over: SHAY DITCH

0.25 MI S OF 152ND AVE, Adams, CO

Built 2006 Load: 32.7 t ADT: 8,232

144TH AVE

Good

Over: WEST FRONTAGE RD

0.10 MI W OF I-25, Adams, CO

Built 2006 Load: 32.7 t ADT: 26,804

ORCHARD PARKWAY

Good

Over: LOCAL DRAINAGE

0.2 MI EAST OF HURON ST., Adams, CO

Built 2015 Load: 32.7 t ADT: 4,895

RAMP TO I 70 WBND

Good

Over: 40TH AVE ML R

PENA BLVD OVER 40TH AVE, Adams, CO

Built 1993 Load: 32.8 t ADT: 33,000

SH 53 ML

Good

Over: 64TH ST DRAIN CANAL

.2 MI S OF I76/BROADWAY, Adams, CO

Built 1993 Load: 32.9 t ADT: 14,000

SCHUMAKER ROAD

Good

Over: LOST CREEK TRIBUTARY

0.1 MI S OF US HWY 36, Adams, CO

Built 1993 Load: 33.4 t ADT: 10

E470 RAMP - I76 EB

Good

Over: Relocated Third Creek

35.28 MI FROM I25, Adams, CO

Built 2002 Load: 33.4 t ADT: 3,000

I76 ML & RAMP

Good

Over: SECOND CREEK

BTWN JCT SH2 AND 120 AVE, Adams, CO

Built 2003 Load: 33.6 t ADT: 32,000

128TH AVE

Good

Over: I25 ML

0.5 MI W OF WASHINGTON ST, Adams, CO

Built 2008 Load: 33.7 t ADT: 15,767

E-470 NB

Good

Over: Burlington Ditch

34.79 MI FROM I25, Adams, CO

Built 2002 Load: 33.7 t ADT: 21,602

E MALL ENTRANCE

Good

Over: LOCAL DRAINAGE

.2 MI E SHERIDAN S 120TH, Adams, CO

Built 1997 Load: 33.7 t ADT: 1,245

SH 44 WB

Good

Over: OBRIAN CANAL

BETWEEN SH 2 AND I76, Adams, CO

Built 2013 Load: 34.0 t ADT: 9,329

E-470 NB

Good

Over: York Street

44.83 MI FROM I25, Adams, CO

Built 2003 Load: 34.0 t ADT: 18,236

E-470 SB

Good

Over: 19th Avenue

20.70 MI FROM I25, Adams, CO

Built 2006 Load: 34.2 t ADT: 18,115

E-470 NB

Good

Over: Holly Street

42.61 MI FROM I25, Adams, CO

Built 2001 Load: 34.3 t ADT: 18,236

E-470 SB

Good

Over: Holly Street

42.61 MI FROM I25, Adams, CO

Built 2001 Load: 34.3 t ADT: 18,466

RAMP TO I 70 WBND

Good

Over: RAMP TO CHAMBERS ROAD R

E / CHAMBERS RD N / I-70, Adams, CO

Built 1993 Load: 34.5 t ADT: 33,000

RAINBOW AVENUE

Good

Over: HOFFMAN DRAINAGE

0.1 MI S OF 88TH AVE., Adams, CO

Built 2017 Load: 34.7 t ADT: 1,656

DEVONSHIRE BLVD

Good

Over: HOFFMAN DRAINAGE

0.2 MI S OF 88TH AVE., Adams, CO

Built 2020 Load: 34.7 t ADT: 8,171

I 76 ML WBND

Good

Over: SOUTH PLATTE RIVER

1.9 MI SW OF JCT US 85, Adams, CO

Built 2013 Load: 34.9 t ADT: 42,000

88TH AVENUE

Good

Over: COMANCHE CREEK

1.2 MI E OF STRASBURG RD, Adams, CO

Built 1997 Load: 35.2 t ADT: 197

120TH AVE WBND

Good

Over: RIVERDALE RD

2 MI W OF US85, Adams, CO

Built 2005 Load: 35.2 t ADT: 9,443

E-470 NB

Good

Over: 19th Avenue

20.70 MI FROM I25, Adams, CO

Built 2006 Load: 35.2 t ADT: 18,212

STEELE STREET

Good

Over: HOFFMAN DRAINAGE

INTERSECT STEELE/86TH, Adams, CO

Built 2017 Load: 35.3 t ADT: 2,256

96TH AVENUE

Good

Over: SAN ARROYO CREEK TRIB

1.2 MI E OF PROSPECT WAY, Adams, CO

Built 1994 Load: 35.3 t ADT: 29

49TH AVENUE

Good

Over: SAND CREEK

JUST W OF SAND CREEK DR, Adams, CO

Built 1987 Load: 35.3 t ADT: 7,394

I76RAMP OVER BRDWY

Good

Over: SH 53 ML-BROADWAY R

I 76 OVER BROADWAY, Adams, CO

Built 1993 Load: 35.3 t ADT: 37,500

PROSPECT WAY

Good

Over: HOFFMAN CREEK

JUST S OF 152ND AVENUE, Adams, CO

Built 1994 Load: 35.5 t ADT: 4

PECOS RMP TO I76WB

Good

Over: BNSF RR RTD Light Rail

.2 MI W OF PECOS STREET, Adams, CO

Built 1989 Load: 35.6 t ADT: 77,000

I 70 ML EBND

Good

Over: SMITH ROAD UP RR

4.3 MI E OF JCT I 225, Adams, CO

Built 2014 Load: 35.6 t ADT: 17,000

MANILA ROAD

Good

Over: BEAR CREEK TRIB.

1.5 MI N OF 88TH AVE, Adams, CO

Built 1992 Load: 35.7 t ADT: 113

E-470 NB

Good

Over: Buckley Road

34.63 MI FROM I25, Adams, CO

Built 2002 Load: 36.0 t ADT: 21,707

E470SB RAMP YORK

Good

Over: Big Dry Creek

44.98 MI FROM I25, Adams, CO

Built 2001 Load: 36.0 t ADT: 370

I 76 ML WBND

Good

Over: BNSF RR RTD Light Rail

.2 MI W OF PECOS STREET, Adams, CO

Built 1989 Load: 36.1 t ADT: 38,500

LOWELL BLVD

Good

Over: LITTLE DRY CREEK

0.3 MILE SOUTH OF 72ND AV, Adams, CO

Built 1986 Load: 36.2 t ADT: 8,969

SH44 ML(104TH AVE)

Good

Over: SOUTH PLATTE RIVER

1.1 MI W OF JCT US 85, Adams, CO

Built 2013 Load: 36.6 t ADT: 14,000

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

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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.