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.
All bridges (535)
I 270 ML WBND
FairOver: WASHINGTON STREET
0.3 MI E. OF I 25, Adams, CO
Built 1998 Load: 33.1 t ADT: 37,500
88TH AVENUE
FairOver: TRIB OF LOST CREEK
0.2 MI W OF CONVERSE ROAD, Adams, CO
Built 1993 Load: 33.3 t ADT: 852
I 76 ML
FairOver: WASHINGTON STREET
0.3 MI E OF I 25, Adams, CO
Built 1990 Load: 33.3 t ADT: 74,000
RAMP TO I76 ML EB
FairOver: YORK ST. R
NE OF JCT I25, Adams, CO
Built 2003 Load: 33.3 t ADT: 42,000
I76 WB OFF RAMP
FairOver: RAMP TO I 25 NBND R
0.1 MI E. OF I25+I76 JCT, Adams, CO
Built 1991 Load: 33.4 t ADT: 37,000
152ND AVENUE
FairOver: HUDSON CANAL
0.2 MILE E OF HARVEST RD, Adams, CO
Built 1989 Load: 33.7 t ADT: 5,901
E-470 SB
FairOver: Burlington Ditch
34.79 MI FROM I25, Adams, CO
Built 2002 Load: 33.7 t ADT: 22,442
CHAMBERS ROAD
FairOver: SAND CREEK
JUST SOUTH OF 28TH AVE, Adams, CO
Built 1973 Load: 33.9 t ADT: 11,649
88TH AVENUE
FairOver: LOCAL DRAINAGE
0.5 MI WEST OF MANILA RD, Adams, CO
Built 1983 Load: 34.2 t ADT: 1,341
168TH AVENUE
FairOver: SOUTH PLATTE RIVER
.3 MI W OF HWY 85, Adams, CO
Built 1989 Load: 34.2 t ADT: 5,537
132ND AVENUE
FairOver: FULTON DITCH
0.3 MI EAST OF HIGHWAY 85, Adams, CO
Built 1992 Load: 34.3 t ADT: 5
US 36 WBND ML
FairOver: I 25 ML RAMPS HOV LANES
INT. 36 and I 25, Adams, CO
Built 1998 Load: 34.3 t ADT: 9,600
US 36 ML
FairOver: BOX ELDER CREEK
0.8 MI E OF WATKINS, Adams, CO
Built 2005 Load: 34.3 t ADT: 2,400
I 70 ML EBND
FairOver: HIGHLINE CANAL
0.2 Mi E OF TOWER ROAD, Adams, CO
Built 1964 Load: 34.6 t ADT: 17,000
84TH AVE
FairOver: I 25 ML
THORNTON, Adams, CO
Built 2012 Load: 34.8 t ADT: 33,457
W MALL ENTRANCE
FairOver: LOCAL DRAINAGE
.1 MI E SHERIDAN S 120TH, Adams, CO
Built 1997 Load: 34.9 t ADT: 1,450
I 76 ML EBND
FairOver: CLEAR CREEK
2.9 MI E -JCT I70+WADSWOR, Adams, CO
Built 1987 Load: 35.3 t ADT: 39,500
144TH AVENUE
FairOver: BADGER CREEK
1.3 MI E OF WINVIEW ROAD, Adams, CO
Built 1978 Load: 35.7 t ADT: 21
WASHINGTON ST
FairOver: CLEAR CREEK
JUST S OF 70TH AVENUE, Adams, CO
Built 1970 Load: 35.7 t ADT: 17,956
BROMLEY LANE
FairOver: FULTON DITCH
1.5 MILES EAST OF SH 85, Adams, CO
Built 1996 Load: 35.7 t ADT: 13,417
I 76 ML EBND
FairOver: BNSF RR RTD Light Rail
.2 MI W OF PECOS STREET, Adams, CO
Built 1989 Load: 35.7 t ADT: 38,500
US 6 ML
FairOver: UP RR
IN COMMERCE CITY, Adams, CO
Built 1950 Load: 36.1 t ADT: 40,000
I 76 ML
FairOver: BURLINGTON CANAL
.3 MI W. OF JCT SH2, Adams, CO
Built 1957 Load: 36.4 t ADT: 33,000
I 70 ML WBND
FairOver: BOX ELDER CREEK
1 MI E OF WATKINS INTERCH, Adams, CO
Built 1960 Load: 36.7 t ADT: 13,000
BROMLEY LANE
FairOver: I 76 ML
4.98 MI NE OF JCT SH 51 -, Adams, CO
Built 1986 Load: 36.8 t ADT: 16,631
SB AIRPORT BLVD
FairOver: SAND CREEK
0.5 MI NORTH OF COLFAX, Adams, CO
Built 1991 Load: 36.9 t ADT: 16,295
I 76 ML
FairOver: BURLINGTON CANAL
0.7 MI NE OF JCT SH 2, Adams, CO
Built 1957 Load: 37.0 t ADT: 32,000
HUDSON ROAD
FairOver: HENRYLYNN CANAL
0.1 MI N OF 164TH, Adams, CO
Built 2006 Load: 37.1 t ADT: 572
STEELE STREET
FairOver: NIVER CREEK
0.28 MI N of 78th PLACE, Adams, CO
Built 1999 Load: 37.3 t ADT: 1,868
136TH AVE
FairOver: I 76 ML
136TH AVE OVER I76 ML, Adams, CO
Built 1994 Load: 37.3 t ADT: 12,149
I 76 ML
FairOver: WEST BURLINGTON CANAL
0.3 MI W OF JCT SH7, Adams, CO
Built 1935 Load: 37.3 t ADT: 28,000
YORK STREET
FairOver: O BRIAN CANAL
0.5 MI N OF BRIGHTON BLVD, Adams, CO
Built 1991 Load: 37.5 t ADT: 8,359
112TH AVENUE
FairOver: BIG DRY CREEK
.25 MI E OF SHERIDAN, Adams, CO
Built 2002 Load: 37.5 t ADT: 16,790
120TH AVENUE
FairOver: SECOND CREEK
.4 MI WEST OF I-76, Adams, CO
Built 2001 Load: 38.1 t ADT: 14,212
SH 224 ML
FairOver: I76 RAMP UP RR
2.6 MI E OF JCT US 36, Adams, CO
Built 1963 Load: 38.1 t ADT: 12,000
104TH AVENUE
FairOver: SECOND CREEK
0.3 MI EAST OF CHAMBERS, Adams, CO
Built 2008 Load: 38.2 t ADT: 11,535
I 76 ML
FairOver: BURLINGTON CANAL
0.9 MI NE OF JCT SH 51, Adams, CO
Built 1957 Load: 38.3 t ADT: 32,000
I76 ONRMP FROM 270
FairOver: I270B RAMP TO I76 WB
NE OF JCT I25, Adams, CO
Built 2003 Load: 38.3 t ADT: 84,000
I76 ML WBND
FairOver: THIRD CREEK
Just N of 470 Parkway, Adams, CO
Built 2002 Load: 38.4 t ADT: 21,000
SOUTHERN ST
FairOver: FULTON DITCH
1.5 MI E SH85/N BROMLEY L, Adams, CO
Built 1996 Load: 38.5 t ADT: 2,845
I-76 EB ON RAMP
FairOver: YORK STREET
NE OF JCT I25, Adams, CO
Built 2000 Load: 38.6 t ADT: 42,000
56TH AVENUE
FairOver: BADGER CREEK
4.2 MI W OF WINVIEW ROAD, Adams, CO
Built 1993 Load: 38.7 t ADT: 3
96TH AVENUE
FairOver: OBRIAN CANAL
1.5 MILES EAST OF I-76, Adams, CO
Built 1994 Load: 38.7 t ADT: 12,537
I 225 ML
FairOver: SMITH RD UP RR
0.4 MI S. OF JCT I70, Adams, CO
Built 1994 Load: 38.7 t ADT: 121,000
COUNTY ROAD
FairOver: I 76 ML
LOCHBUIE INTERCHANGE, Adams, CO
Built 1981 Load: 38.7 t ADT: 8,326
HAVANA STREET
FairOver: OBRIAN CANAL
0.6 MI N OF 96TH AVE, Adams, CO
Built 1984 Load: 39.0 t ADT: 1,788
I 70 BUS SPUR
FairOver: I 70 ML
WATKINS INTERCHANGE, Adams, CO
Built 1960 Load: 39.0 t ADT: 3,300
SH 53 ML
FairOver: I 25 ML
58TH AVE OVER I25, Adams, CO
Built 1992 Load: 39.1 t ADT: 20,000
PICADILLY ROAD
FairOver: THIRD CREEK
1.3 MI NORTH OF 96TH AVE, Adams, CO
Built 1995 Load: 39.2 t ADT: 1,984
RIVERDALE ROAD
FairOver: TODD CREEK
0.8 MI S OF 160TH AVE, Adams, CO
Built 1960 Load: 39.3 t ADT: 2,323
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.