Total bridges
535
Public highway bridges in Adams County
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.
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
- 1930s 3
1930–1939
3 bridges
- 1940s 6
1940–1949
6 bridges
- 1950s 18
1950–1959
18 bridges
- 1960s
1960–1969
61 bridges
- 1970s 42
1970–1979
42 bridges
- 1980s
1980–1989
67 bridges
- 1990s
1990–1999
152 bridges
- 2000s
2000–2009
134 bridges
- 2010s 45
2010–2019
45 bridges
- 2020s 7
2020–2029
7 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.
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Weld County | 614 | 36.8% | 58.5% | 4.7% | 1986 |
| Larimer County | 559 | 49% | 49% | 2% | 1987 |
| Adams County (this page) | 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 |
| Arapahoe County | 391 | 26.1% | 66.8% | 7.2% | 1984 |
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).
- Marathon County, WI · 530 bridges
- Merced County, CA · 528 bridges
- LaSalle County, IL · 528 bridges
- Nueces County, TX · 528 bridges
Similar average build year
Nearest mean year-built outside CO (1990 here).
- Maricopa County, AZ · avg 1990 · 2,847 bridges
- Tarrant County, TX · avg 1990 · 2,617 bridges
- Fairfax County, VA · avg 1990 · 751 bridges
- Guilford County, NC · avg 1990 · 736 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (263)
I76 ML EBND
FairOver: I 270 ML
1.1 MI NE OF JCT I25, Adams, CO
Built 2003 Load: 39.5 t ADT: 42,000
HAVANA STREET
FairOver: TODD CREEK
.5 MI S OF 160TH AVE, Adams, CO
Built 1998 Load: 39.6 t ADT: 1,508
SH 2 ML
FairOver: I 76 ML
JCT I 76 NE OF DENVER, Adams, CO
Built 1999 Load: 39.6 t ADT: 14,372
SH 79 ML
FairOver: I 70 ML
11.4 MI E OF JCT US 36, Adams, CO
Built 1959 Load: 39.6 t ADT: 5,900
17TH PLACE
FairOver: TOLL GATE CREEK
0.1 MI E OF FITZSIMMONS P, Adams, CO
Built 2012 Load: 39.7 t ADT: 16,966
SH 7 aka Bridge ST
FairOver: I 76 ML
4.41 MI E JCT SH 51-BRIGH, Adams, CO
Built 1986 Load: 39.9 t ADT: 2,000
I76 ML WBND
FairOver: I 270 ML
1.1 MI NE OF JCT I25, Adams, CO
Built 2003 Load: 40.0 t ADT: 42,000
STRASBURG ROAD
FairOver: WOLF CREEK
1.5 MI NORTH OF 88TH AVE, Adams, CO
Built 1988 Load: 40.6 t ADT: 503
SH 53 ML
FairOver: CLEAR CREEK
6700 N. BROADWAY, Adams, CO
Built 1971 Load: 40.6 t ADT: 11,000
W 62nd Ave
FairOver: I 76 ML
1 MI W OF JCT I25 & I-70, Adams, CO
Built 1992 Load: 40.6 t ADT: 3,191
I 225 NB RAMP
FairOver: I 70 ML
DENVER, Adams, CO
Built 1997 Load: 40.8 t ADT: 60,500
E-470 ML
FairOver: First Creek
0.35 MI North of I-70, Adams, CO
Built 1996 Load: 40.8 t ADT: 36,174
26th Avenue
FairOver: E-470
21.43 MI FROM I25, Adams, CO
Built 1997 Load: 40.8 t ADT: 1,900
48th Avenue-Future
FairOver: E-470
23.43 MI FROM I25, Adams, CO
Built 1997 Load: 40.8 t ADT: 29,000
56th Avenue
FairOver: E-470
24.44 MI FROM I25, Adams, CO
Built 1996 Load: 40.8 t ADT: 10,300
88th Avenue
FairOver: E-470
29.39 MI FROM I25, Adams, CO
Built 1996 Load: 40.8 t ADT: 43,000
96th Avenue
FairOver: E-470
30.46 MI FROM I25, Adams, CO
Built 1996 Load: 40.8 t ADT: 43,000
104th Avenue
FairOver: E-470
31.57 MI FROM I25, Adams, CO
Built 1996 Load: 40.8 t ADT: 4,000
112th Avenue
FairOver: E-470
32.57 MI FROM I25, Adams, CO
Built 1996 Load: 40.8 t ADT: 4,000
WASHINGTON ST
FairOver: BIG DRY CREEK
0.3 MI N OF 136TH AVE, Adams, CO
Built 1993 Load: 41.2 t ADT: 5,795
I76 EB ML
FairOver: I76 WB ON RAMP FROM I270
NE OF JCT I25, Adams, CO
Built 2003 Load: 41.9 t ADT: 42,000
I 70 ML
FairOver: DRAW
0.75 MI W OF WATKINS INTC, Adams, CO
Built 1960 Load: 42.4 t ADT: 26,000
PEORIA STREET
FairOver: BARANMOR DITCH
PEORIA and BARANMOR PKWY, Adams, CO
Built 2014 Load: 42.5 t ADT: 25,984
BUCKLEY ROAD
FairOver: I 76 ML BNSF RR
BUCKLEY RD @ I76 and BN, Adams, CO
Built 1994 Load: 42.5 t ADT: 4,513
US 36 ML
FairOver: PECOS STREET
IN WESTMINSTER, Adams, CO
Built 2001 Load: 42.7 t ADT: 129,000
120TH AVE
FairOver: BRANTNER DITCH
2 MI W OF US85, Adams, CO
Built 2005 Load: 43.4 t ADT: 9,217
RAMP TO I 76 WBND
FairOver: RAMP CLEAR CREEK R
NW OF I76 and I25 INT, Adams, CO
Built 1992 Load: 43.5 t ADT: 37,500
120TH AVE.
FairOver: I76 ML/BNSF/CANAL/AC RD
120TH AVE. OVER I76, Adams, CO
Built 2002 Load: 44.1 t ADT: 20,844
I 70 ML WBND
FairOver: COUNTY ROADS 22N 89
1.5 MI E OF WATKINS, Adams, CO
Built 1960 Load: 44.4 t ADT: 13,000
I 70 ML EBND
FairOver: COUNTY ROADS 22N 89
0.7 MI E OF JCT US 36, Adams, CO
Built 1960 Load: 44.4 t ADT: 13,000
SH 22 ML
FairOver: FULTON CANAL
.1MI W OF JCT US 85, Adams, CO
Built 1972 Load: 44.5 t ADT: 4,000
I 25 ML
FairOver: UP RR
0.8 MI SO OF JCT I-76, Adams, CO
Built 1993 Load: 44.5 t ADT: 196,000
SH 2 ML
FairOver: BNSF RR
.2 MI S OF JCT I76, Adams, CO
Built 1999 Load: 44.5 t ADT: 16,034
I 25 SBND
FairOver: WAGON RD RTD RAMP R
.2 MI S OF JCT SH 128-120, Adams, CO
Built 1992 Load: 45.4 t ADT: 67,500
I 70 ML/ FRONTAGE
FairOver: FIRST CREEK
1 MI E OF JCT US 40, Adams, CO
Built 1974 Load: 45.4 t ADT: 27,000
YORK STREET
FairOver: BIG DRY CREEK
200 FT S OF 156TH AVE, Adams, CO
Built 1995 Load: 46.2 t ADT: 8,778
120TH AVENUE
FairOver: BOX ELDER CREEK
0.3 MI WEST OF WATKINS RD, Adams, CO
Built 1997 Load: 46.4 t ADT: 2,358
CHAMBERS ROAD
FairOver: FULTON DITCH
.5 MI SOUTH OF BROMLEY, Adams, CO
Built 2000 Load: 46.8 t ADT: 804
EAGLE STREET
FairOver: SABLE DITCH
E OF SABLE AND S OF 23R, Adams, CO
Built 1981 Load: 47.6 t ADT: 136
HUDSON ROAD
FairOver: COYOTE RUN
.6 MI N OF 26TH AVENUE, Adams, CO
Built 1960 Load: 48.1 t ADT: 993
PECOS ST.
FairOver: BNSF MAINLIN /W 59TH AVE
0.2 MI S. OF I-76, Adams, CO
Built 2012 Load: 48.5 t ADT: 2,325
I 270 EBND ML
FairOver: I25NB/I25HOV/WB I 270
SBND I25 & EBND I270, Adams, CO
Built 2009 Load: 48.6 t ADT: 18,000
US 85 ML
FairOver: SECOND CREEK
5.2 MI NO OF JCT I-76, Adams, CO
Built 1953 Load: 50.1 t ADT: 34,000
US 36 ML
FairOver: DRAW
9.7 MI E OF JCT I-70, Adams, CO
Built 1983 Load: 50.2 t ADT: 1,900
VRAIN STREET
FairOver: LOCAL DRAINAGE
.3 MI E SHERIDAN S 120TH, Adams, CO
Built 1997 Load: 50.2 t ADT: 7,063
YOSEMITE STREET
FairOver: TODD CREEK TRIBUTARY
0.4 MI SOUTH OF 152ND AVE, Adams, CO
Built 2001 Load: 50.7 t ADT: 963
SH 95 ML
FairOver: UP RR RR SPUR LT RAIL
SHERIDAN 1.3 MI N OF I 70, Adams, CO
Built 2011 Load: 51.2 t ADT: 35,000
TOWER ROAD
FairOver: LOCAL DRAINAGE
JUST S OF 22ND PL, Adams, CO
Built 1981 Load: 56.1 t ADT: 14,612
YORK STREET
FairOver: CLEAR CREEK
72ND AND YORK, Adams, CO
Built 1965 Load: 58.0 t ADT: 13,608
US 85 ML
FairOver: THIRD CREEK
6 MI NO OF JCT I-76, Adams, CO
Built 1953 Load: 59.1 t ADT: 34,000
Read our methodology - how this data is sourced, computed, and verified.
Related
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.