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

All bridges (535)

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

136TH AVENUE

Good

Over: BIG DRY CREEK

0.6 MI E OF I-25, Adams, CO

Built 2004 Load: 36.8 t ADT: 22,524

152ND AVENUE

Good

Over: HOFFMAN CREEK

0.7 MI E OF PROSPECT WAY, Adams, CO

Built 1995 Load: 36.9 t ADT: 15

I 76 ML EBND

Good

Over: LOWELL BLVD

1.04 MI E OF JCT SH 95, Adams, CO

Built 1986 Load: 36.9 t ADT: 39,500

I 76 ML WBND

Good

Over: LOWELL BLVD

1.06 MI E OF JCT SH95, Adams, CO

Built 1986 Load: 36.9 t ADT: 39,500

RAMP TO PECOS ST

Good

Over: BNSF RR RTD Light Rail

.2 MI W OF PECOS STREET, Adams, CO

Built 1989 Load: 36.9 t ADT: 77,000

160TH AVENUE

Good

Over: LOCAL DRAINAGE

0.3 MI E OF MANILA RD, Adams, CO

Built 1993 Load: 37.0 t ADT: 81

SABLE BLVD

Good

Over: SAND CREEK

JUST NORTH OF 28TH AVE, Adams, CO

Built 1975 Load: 37.0 t ADT: 9,902

SH 53 SERVICE RD.

Good

Over: 64TH ST DRAIN CANAL AR

JUST W OF 64TH/ BRDWY, Adams, CO

Built 1993 Load: 37.0 t ADT: 5,000

RAMP TO I 25 NBND

Good

Over: CLEAR CREEK R

.2 MI N 76; .1 MI E I-25, Adams, CO

Built 1992 Load: 37.2 t ADT: 121,000

SABLE BLVD

Good

Over: SABLE DITCH

JUST S OF 23RD AVE, Adams, CO

Built 1992 Load: 37.7 t ADT: 9,528

PENA BLVD NBND RMP

Good

Over: AIRPORT BLVD SBND

PENA BLVD OVER I70 ML, Adams, CO

Built 1993 Load: 38.5 t ADT: 54,507

120TH AVENUE

Good

Over: FULTON DITCH

0.6 MI E OF BRIGHTON RD, Adams, CO

Built 2005 Load: 38.6 t ADT: 17,487

120TH AVENUE

Good

Over: LOCAL DRAINAGE

INT OF LAREDO AND 120TH, Adams, CO

Built 2005 Load: 38.6 t ADT: 1,414

SH 44 EB

Good

Over: OBRIAN CANAL

BETWEEN SH 2 AND I76, Adams, CO

Built 2013 Load: 38.6 t ADT: 8,829

I 225 ML

Good

Over: US 40 ML

IN AURORA, Adams, CO

Built 1988 Load: 38.8 t ADT: 140,000

WB MONTVIEW BLVD

Good

Over: WESTERLY CREEK

0.26 MI E OF YOSEMITE, Adams, CO

Built 2014 Load: 38.9 t ADT: 10,906

I 70 ML WBND

Good

Over: SMITH ROAD UP RR

4.3 MI E OF JCT I 225, Adams, CO

Built 2014 Load: 38.9 t ADT: 17,000

64TH AVENUE

Good

Over: LITTLE DRY CRK LRT/RR

.4 MI WEST OF PECOS, Adams, CO

Built 2016 Load: 39.2 t ADT: 4,530

120TH AVE EBND

Good

Over: S. PLATTE RIVER

1.5 MI W OF US85, Adams, CO

Built 2005 Load: 39.2 t ADT: 8,991

I 76 ML WBND

Good

Over: UP RR

0.2 MI E OF JCT US 85, Adams, CO

Built 2014 Load: 39.6 t ADT: 16,500

I25 NB RAMP TO 224

Good

Over: CLEAR CREEK R

I-25NB to SH224 70th Ave, Adams, CO

Built 1998 Load: 40.2 t ADT: 10,000

112TH AVENUE

Good

Over: MUDDY CREEK

.3 MI E OF PRICE ROAD, Adams, CO

Built 1999 Load: 40.6 t ADT: 30

BELLE CREEK BLVD

Good

Over: BELLE CREEK

NW OF 104TH AND SH85, Adams, CO

Built 2003 Load: 40.6 t ADT: 3,208

PENA BLVD NBND RMP

Good

Over: I 70 ML

.8 MI E OF CHAMBERS ROAD, Adams, CO

Built 1993 Load: 40.6 t ADT: 54,507

I 76 ML WBND

Good

Over: TENNYSON STREET

0.53 MI E OF JCT 95, Adams, CO

Built 1986 Load: 40.8 t ADT: 39,500

64th Avenue

Good

Over: E-470

25.48 MI FROM I25, Adams, CO

Built 1996 Load: 40.8 t ADT: 10,200

Tower Road

Good

Over: E-470

33.22 MI FROM I25, Adams, CO

Built 1996 Load: 40.8 t ADT: 9,100

SABLE ROAD/SH 2

Good

Over: E-470

36.27 MI FROM I25, Adams, CO

Built 2002 Load: 40.8 t ADT: 27,878

E-470 CONNECTOR

Good

Over: US 85 ML

37.72 MI FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 1,500

US 85 CONNECTOR

Good

Over: E-470

38.38 MILES FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 1,500

BRIGHTON BLVD

Good

Over: E-470

38.47 MI FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 3,200

QUEBEC STREET

Good

Over: E-470 ML

41.57 MI FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 2,500

COLORADO BLVD

Good

Over: E-470 ML

43.66 MI FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 944

YORK ST NB RAMP

Good

Over: Big Dry Creek

BIG DRY CREEK, Adams, CO

Built 2001 Load: 40.8 t ADT: 400

WASHINGTON STREET

Good

Over: E-470 ML

4.587 MI FROM I25, Adams, CO

Built 2001 Load: 40.8 t ADT: 11,468

120TH AVE WBND

Good

Over: S. PLATTE RIVER

1.5 MI W OF US85, Adams, CO

Built 2005 Load: 41.1 t ADT: 8,991

I 76 ML

Good

Over: YORK STREET

1.33 Mi E of JCT I25, Adams, CO

Built 2023 Load: 41.1 t ADT: 84,000

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.