County profile · official public datasets

Larimer County, CO

559 public highway bridges tracked in the FHWA National Bridge Inventory: 49% rated Good, 49% Fair, 2% Poor.

559
Public bridges
49%
Good condition
2%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Larimer 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 25%
lowest Poor share in state
2%
Poor-condition share
559
public highway bridges
1987
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.

Larimer County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Larimer County ranks #16 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2%). Larimer County, Colorado contains 559 public highway bridges. Roughly 49% are rated “Good,” 49% “Fair,” and 2% “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

559

Public highway bridges in Larimer County

Good condition

49%

274 of 559 rated 7-9

Fair condition

49%

274 of 559 rated 5-6

Poor condition

2%

11 of 559 rated 4 or below

In-state Poor-share rank

#16 of 64

Among Colorado counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 559 NBI-tracked bridges by lowest applicable component rating.

Good
49% (274)
Fair
49% (274)
Poor
2% (11)

Larimer County's Poor-condition bridges carry 57,230 vehicle crossings a day

That is 1.4% of the county's reported daily bridge traffic on 2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 5,203 crossings a day against 8,152 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 557 of 559 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

28.8% of Larimer County's bridges have passed the 50-year mark

161 of the 559 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 49% 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 33.2% of the county's Poor-condition bridge traffic

SH 392 ML over CACHE LA POUDRE RIVER, built 1959, carries 19,000 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 57,230 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Larimer County's bridges were built

559 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 102 of the county's bridges still in the inventory were built, which is 18.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1987, 5 years newer than the Colorado average of 1982.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Larimer County compares with Colorado's closest counties by inventory size

The 5 Colorado counties nearest Larimer County in number of bridges, with their condition splits. Its 2% Poor share is the 2nd-lowest of these 6. Its average build year of 1987 against a peer-group mean of 1987 is in line with the group.

Showing the 5 closest of 63 Colorado counties eligible for comparison.

Bridge inventory size and condition shares for Larimer County and the 5 Colorado counties closest to it in inventory size
County Bridges Poor
El Paso County 686 3.2%
Weld County 614 4.7%
Larimer County (this page) 559 2%
Adams County 535 6.9%
Jefferson County 464 6.3%
Denver County 458 1.7%

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 Larimer 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 Larimer County, both outside Colorado so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside CO (559 bridges here).

Similar average build year

Nearest mean year-built outside CO (1987 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 559 Good 274 Fair 274 Poor 11

Good-condition bridges (274)

57th Street

Good

Over: Louden Ditch

W of Garfield Ave/SH287, Larimer, CO

Built 2007 Load: 32.7 t ADT: 11,414

Denver Avenue

Good

Over: Greeley Loveland Canal

0.1 Mi N of US Hwy 34, Larimer, CO

Built 1985 Load: 32.7 t ADT: 3,035

SW 14th Street

Good

Over: Misc Drainage Basin

600 FT W of Katie Ave, Larimer, CO

Built 1901 Load: 32.7 t ADT: 6,085

County Road 14

Good

Over: Home Supply Ditch

JUST W. OF CR 21, Larimer, CO

Built 2007 Load: 32.7 t ADT: 4,191

County Road 24

Good

Over: Buckhorn Creek

0.8 Mi E of Co Rd 27, Larimer, CO

Built 1965 Load: 32.7 t ADT: 437

County Road 31D

Good

Over: Handy Ditch

50 ft N of Co Rd 22H, Larimer, CO

Built 1951 Load: 32.7 t ADT: 250

County Road 43

Good

Over: N Fork Big Thompson Rive

3.3 Mi SE of Co Rd 51B, Larimer, CO

Built 2016 Load: 32.7 t ADT: 349

County Road 9

Good

Over: Larimer County Canal

0.4 Mi N of Co Rd 56, Larimer, CO

Built 2018 Load: 32.7 t ADT: 3,250

Access Road

Good

Over: Big Thompson River

25 ft S on US 34, Larimer, CO

Built 2018 Load: 32.7 t ADT: 16

Bluff Lane

Good

Over: Handy Ditch

0.5 Mi W of S CR 23, Larimer, CO

Built 2016 Load: 32.7 t ADT: 96

Bluff Lane

Good

Over: Home Supply Ditch

300 FT W of S CR 23, Larimer, CO

Built 2016 Load: 32.7 t ADT: 77

Stanton Ridge Road

Good

Over: Unnamed Canal

S of E CR 32, Larimer, CO

Built 2016 Load: 32.7 t ADT: 262

Willows Bend Dr.

Good

Over: Handy Ditch

0.4 Mi S of W CR 20, Larimer, CO

Built 2016 Load: 32.7 t ADT: 22

Mount Owens Street

Good

Over: Local Drainage

10 Ft W of Frontage Road, Larimer, CO

Built 2005 Load: 32.7 t ADT: 524

Ronald Reagan Ave.

Good

Over: Local Drainage

10 Ft W Frontage Road, Larimer, CO

Built 2005 Load: 32.7 t ADT: 1,564

Namaqua Avenue

Good

Over: Big Barnes Ditch

600 Ft S of US Hwy 34, Larimer, CO

Built 1992 Load: 32.8 t ADT: 4,626

US 287 ML

Good

Over: DRY CREEK

7.2 MI N OF JCT SH 66, Larimer, CO

Built 2005 Load: 32.9 t ADT: 18,000

Wildbriar Lane

Good

Over: Big Thompson River

0.2 Mi NW Cedar Cove Rd, Larimer, CO

Built 2019 Load: 33.0 t ADT: 5

US 287 ML

Good

Over: DRAW

0.9 MI N OF JCT SH 1, Larimer, CO

Built 2012 Load: 33.7 t ADT: 11,000

Mc Clelland Drive

Good

Over: Larimer County Canal #2

20 ft S. W foothill Pkwy, Larimer, CO

Built 2019 Load: 33.7 t ADT: 4,020

Prospect Road

Good

Over: New Mercer Canal

0.1 Mi E of Brentwood Dr, Larimer, CO

Built 2014 Load: 33.7 t ADT: 15,960

Rossum Drive

Good

Over: Big Barnes Ditch

0.1 Mi South of US 34, Larimer, CO

Built 2002 Load: 33.7 t ADT: 1,371

County Road 103

Good

Over: Laramie River

15. Mi N of St Hwy 14, Larimer, CO

Built 1991 Load: 33.7 t ADT: 57

Namaqua Avenue

Good

Over: Big Thompson River

0.5 Mi N of W 1st St., Larimer, CO

Built 2019 Load: 33.7 t ADT: 5,082

CR 904/CR 13

Good

Over: Little Thompson River

0.2 Mi N of Co Rd 6C, Larimer, CO

Built 1988 Load: 33.7 t ADT: 3,225

Jasper Lake Road

Good

Over: Big Thompson River

0.1 Mi N of US Hwy 34, Larimer, CO

Built 2014 Load: 34.0 t ADT: 25

County Road 29

Good

Over: Dry Creek

100 Ft N of Co Rd 18E, Larimer, CO

Built 1986 Load: 34.1 t ADT: 3,219

I 25 ML SBND

Good

Over: BNSF RR

0.5 MI N OF JCT SH 14, Larimer, CO

Built 1966 Load: 34.3 t ADT: 19,000

US 34 ML EBND

Good

Over: LOVELAND-GREELEY CANAL

1.2 MI E OF JCT US 287, Larimer, CO

Built 1965 Load: 34.7 t ADT: 22,000

LaPorte Avenue

Good

Over: Larimer Co. Canal No. 2

Junction with Frey Avenue, Larimer, CO

Built 1989 Load: 34.7 t ADT: 4,980

Ronald Reagan Ave.

Good

Over: Boxelder Creek

West of 3rd Street, Larimer, CO

Built 2005 Load: 34.7 t ADT: 744

High Plains Road

Good

Over: Greeley Loveland Canal

0.1 Mi N of US Hwy 34, Larimer, CO

Built 1986 Load: 34.8 t ADT: 212

Strauss Cabin Road

Good

Over: Fossil Creek Res. Inlet

0.4 Mi S of Harmony Road, Larimer, CO

Built 2005 Load: 35.1 t ADT: 2,164

County Road 27

Good

Over: Buckhorn Creek

0.8 Mi NW of Co Rd 38E, Larimer, CO

Built 1993 Load: 35.1 t ADT: 806

County Road 45B

Good

Over: Little Thompson River

1.0 mile east 36, Larimer, CO

Built 2015 Load: 35.3 t ADT: 122

US 34 ML WBND

Good

Over: LOVELAND-GREELEY CANAL

3 MI W OF JCT I 25, Larimer, CO

Built 1965 Load: 35.4 t ADT: 22,000

COUNTY ROAD 48

Good

Over: I 25 ML

MILE MRKR 270.314, Larimer, CO

Built 2018 Load: 35.6 t ADT: 7,569

I 25 ML SBND

Good

Over: RR SPUR

2.9 MI S OF JCT SH 14, Larimer, CO

Built 2023 Load: 35.6 t ADT: 24,500

KECHTER RD

Good

Over: I 25 ML

2 MI N OF SH 392, Larimer, CO

Built 2022 Load: 35.6 t ADT: 6,317

US 34 ML

Good

Over: BIG THOMPSON RIVER

_, Larimer, CO

Built 2018 Load: 35.6 t ADT: 4,900

I 25 ML

Good

Over: HILLSBORO TRIBUTARY

1.6 MI NO OF JCT SH 60, Larimer, CO

Built 2020 Load: 35.6 t ADT: 86,000

Horsetooth Road

Good

Over: Larimer Co Canal No. 2

50 ft W of College Ave, Larimer, CO

Built 2018 Load: 35.6 t ADT: 21,245

County Road 15

Good

Over: Little Thompson River

0.9 Mi N of Co Rd 4, Larimer, CO

Built 2018 Load: 35.6 t ADT: 1,452

County Road 18

Good

Over: Handy Ditch

0.4 Mi E of Co Rd 23E, Larimer, CO

Built 2017 Load: 35.6 t ADT: 1,397

County Rd 43

Good

Over: N. Fork Big Thompson

0.3 MI E of Horseshoe Rd, Larimer, CO

Built 2016 Load: 35.6 t ADT: 415

County Rd 43

Good

Over: N. Fork Big Thompson

1.3 MI E of Horseshoe Rd, Larimer, CO

Built 2016 Load: 35.6 t ADT: 415

Prospect Road

Good

Over: Cache La Poudre Overflow

0.7 Mi. E of Sharp Point, Larimer, CO

Built 2006 Load: 36.1 t ADT: 22,557

County Road 80C

Good

Over: Laramie River

0.3 Mi W of Co Rd 103, Larimer, CO

Built 1999 Load: 36.2 t ADT: 13

SPRAGUE LAKE ROAD

Good

Over: GLACIER CREEK

0.2 miles from Bear Lake, Larimer, CO

Built 2004 Load: 36.3 t ADT: 500

County Road 54

Good

Over: Box Elder Creek

0.5 Mi East of I-25, Larimer, CO

Built 1993 Load: 36.3 t ADT: 98

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.