Total bridges
66
Public highway bridges in Broomfield County
County profile · official public datasets
Broomfield County, CO
66 public highway bridges tracked in the FHWA National Bridge Inventory: 42.4% rated Good, 56.1% Fair, 1.5% Poor.
- 66
- Public bridges
- 42.4%
- Good condition
- 1.5%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Broomfield County pairs a top-quartile lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 14%
- lowest Poor share in state
- 1.5%
- Poor-condition share
- 66
- public highway bridges
- 2000
- 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.
Broomfield County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Broomfield County ranks #9 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.5%). Broomfield County, Colorado contains 66 public highway bridges. Roughly 42.4% are rated “Good,” 56.1% “Fair,” and 1.5% “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
42.4%
28 of 66 rated 7-9
Fair condition
56.1%
37 of 66 rated 5-6
Poor condition
1.5%
1 of 66 rated 4 or below
In-state Poor-share rank
#9 of 64
Among Colorado counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 66 NBI-tracked bridges by lowest applicable component rating.
Good 42.4% (28)
Fair 56.1% (37)
Poor 1.5% (1)
Broomfield County's Poor-condition bridges carry 25,000 vehicle crossings a day
That is 2.6% of the county's reported daily bridge traffic on 1.5% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 25,000 crossings a day against 17,076 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 66 of 66 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
4.5% of Broomfield County's bridges have passed the 50-year mark
3 of the 66 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 42.4% 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 100% of the county's Poor-condition bridge traffic
SH 121 ML SBND over US 287 ML RR SPUR, built 1972, carries 25,000 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 1-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 25,000 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Broomfield County's bridges were built
66 bridges with a recorded construction year, grouped by decade
- 1960s 1
1960–1969
1 bridges
- 1970s 2
1970–1979
2 bridges
- 1980s 5
1980–1989
5 bridges
- 1990s 13
1990–1999
13 bridges
- 2000s
2000–2009
39 bridges
- 2010s 6
2010–2019
6 bridges
What this shows Construction peaked in the 2000s, when 39 of the county's bridges still in the inventory were built, which is 59.1% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 2000, 18 years newer than the Colorado average of 1982.
How Broomfield County compares with Colorado's closest counties by inventory size
The 5 Colorado counties nearest Broomfield County in number of bridges, with their condition splits. Its 1.5% Poor share is the 1st-lowest of these 6. Its average build year of 2000 against a peer-group mean of 1981 is 19 years newer.
Showing the 5 closest of 63 Colorado counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Bent County | 68 | 23.5% | 73.5% | 2.9% | 1976 |
| Broomfield County (this page) | 66 | 42.4% | 56.1% | 1.5% | 2000 |
| Delta County | 64 | 51.6% | 45.3% | 3.1% | 1986 |
| Sedgwick County | 64 | 40.6% | 57.8% | 1.6% | 1981 |
| Conejos County | 62 | 38.7% | 46.8% | 14.5% | 1976 |
| Pitkin County | 62 | 38.7% | 58.1% | 3.2% | 1985 |
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 Broomfield 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 Broomfield County, both outside Colorado so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CO (66 bridges here).
- Chugach County, AK · 66 bridges
- Inyo County, CA · 66 bridges
- Cook County, GA · 66 bridges
- Greene County, GA · 66 bridges
Similar average build year
Nearest mean year-built outside CO (2000 here).
- Seminole County, FL · avg 2000 · 177 bridges
- Dare County, NC · avg 2000 · 40 bridges
- Aleutians East County, AK · avg 2000 · 16 bridges
- Collin County, TX · avg 1998 · 1,127 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (37)
US 287 ML
FairOver: FLOOD CONTROL DITCH
120TH AVE W. OF CHASE ST., Broomfield, CO
Built 1965 Load: 25.4 t ADT: 29,000
Hazel Street
FairOver: Local Drainage
Just S of Midway Blvd, Broomfield, CO
Built 1985 Load: 27.0 t ADT: 1,346
104TH Street
FairOver: NWP
6.98 MI FROM I-25, Broomfield, CO
Built 2002 Load: 30.2 t ADT: 1,520
96TH STREET
FairOver: US 36 ML
IN BROOMFIELD, Broomfield, CO
Built 1995 Load: 31.2 t ADT: 21,924
104TH AVE/CHURCH R
FairOver: US 36 ML
2.4 MI SE BOULDER-JEFF CL, Broomfield, CO
Built 1991 Load: 32.6 t ADT: 27,233
Briarwood Drive
FairOver: Local Drainage
Just South of Trails Ave, Broomfield, CO
Built 1987 Load: 32.7 t ADT: 290
Midway Blvd
FairOver: Rock Creek Overflow
0.3 mi S of Via Varra, Broomfield, CO
Built 2006 Load: 32.7 t ADT: 4,495
West Sixth Avenue
FairOver: Graves and Dennison Dtch
At Int of Alter & 6th, Broomfield, CO
Built 1985 Load: 32.7 t ADT: 3,667
NWP EB
FairOver: WB Dillon Road
5.59 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 2,500
NWP EB
FairOver: Rock Creek
5.68 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 15,000
NWP WB
FairOver: Rock Creek
5.68 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 12,000
NWP EB
FairOver: EB Dillon Road
6.25 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 6,268
NWP WB
FairOver: EB Dillon Road
6.25 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 12,000
NWP Ramp
FairOver: EB Dillon Road
6.29 MI FROM I-25, Broomfield, CO
Built 2002 Load: 32.7 t ADT: 1,100
120TH STREET
FairOver: NWP
4.77 MI FROM I-25, Broomfield, CO
Built 2002 Load: 33.7 t ADT: 4,189
NWP Ramp
FairOver: Rock Creek
5.69 MI FROM I-25, Broomfield, CO
Built 2002 Load: 34.6 t ADT: 12,000
Sheridan Parkway
FairOver: NWP
1.64 MI FROM I-25, Broomfield, CO
Built 2002 Load: 35.2 t ADT: 5,000
SH 128 (120TH AVE)
FairOver: US 36 ML
120TH AVE AND US 36, Broomfield, CO
Built 2011 Load: 35.4 t ADT: 19,000
US 36 ML
FairOver: BNSF RR
IN WESTMINSTER, Broomfield, CO
Built 2017 Load: 38.9 t ADT: 74,000
SH 121 ML NBND
FairOver: US 287 ML RR SPUR
IN BROOMFIELD, Broomfield, CO
Built 1972 Load: 39.1 t ADT: 25,000
Chase Street
FairOver: Local Drainage
At 120th Avenue, Broomfield, CO
Built 2000 Load: 39.5 t ADT: 3,372
NWP EB
FairOver: US 287
5.95 FROM I-25, Broomfield, CO
Built 2002 Load: 40.9 t ADT: 12,000
NWP WB
FairOver: US 287
5.95 FROM I-25, Broomfield, CO
Built 2002 Load: 40.9 t ADT: 12,000
Huron Street
FairOver: NWP
0.50 MI FROM I25, Broomfield, CO
Built 2002 Load: 41.8 t ADT: 5,000
NWP EB
FairOver: BNSF
5.81 MI FROM I-25, Broomfield, CO
Built 2002 Load: 42.1 t ADT: 12,000
NWP WB
FairOver: BNSF
5.81 MI FROM I-25, Broomfield, CO
Built 2002 Load: 42.1 t ADT: 12,000
NWP EB
FairOver: BNSF
7.68 MI FROM I-25, Broomfield, CO
Built 2002 Load: 43.0 t ADT: 12,000
NWP WB
FairOver: BNSF
7.68 MI FROM I-25, Broomfield, CO
Built 2002 Load: 43.0 t ADT: 12,000
Lowell Blvd.
FairOver: NWP
2.56 MILES FROM I-25, Broomfield, CO
Built 2002 Load: 43.5 t ADT: 5,282
Main Street
FairOver: Local Drainage
0.1 Mi N of 2nd Street, Broomfield, CO
Built 1987 Load: 44.4 t ADT: 10,974
East 1st Street
FairOver: Local Drainage
150 Ft E of Kirk Street, Broomfield, CO
Built 1999 Load: 59.1 t ADT: 6,265
NWP Ramp
FairOver: WB Dillon Road
5.57 MI FROM I-25, Broomfield, CO
Built 2002 Load: 60.5 t ADT: 2,500
Interlocken Loop
FairOver: Ped. Underpass/Drainage
Just N of Interlocken Blv, Broomfield, CO
Built 2000 Load: 67.8 t ADT: 12,852
Interlocken Blvd.
FairOver: Ped. Underpass/Drainage
100 Ft SE of W Flatiron, Broomfield, CO
Built 1999 Load: 73.7 t ADT: 5,799
Interlocken Loop
FairOver: Pedestrian Underpass
125 Ft. N of Eldorado, Broomfield, CO
Built 1999 Load: 99.9 t ADT: 12,139
Interlocken Loop
FairOver: Pedestrian Underpass
0.1 Mi N of W. Flatiron C, Broomfield, CO
Built 2000 Load: 99.9 t ADT: 12,804
Northwest Parkway
FairOver: Rock Creek
0.2 Mi N OF US Hwy 36, Broomfield, CO
Built 1999 Load: 99.9 t ADT: 27,763
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.