County profile · official public datasets

Routt County, CO

96 public highway bridges tracked in the FHWA National Bridge Inventory: 43.8% rated Good, 50% Fair, 6.3% Poor.

96
Public bridges
43.8%
Good condition
6.3%
Poor condition

The verdict

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

Routt County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

41st
of 64 on Poor share
6.3%
Poor-condition share
96
public highway bridges
1984
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.

Routt County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Routt County ranks #41 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.3%). Routt County, Colorado contains 96 public highway bridges. Roughly 43.8% are rated “Good,” 50% “Fair,” and 6.3% “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

96

Public highway bridges in Routt County

Good condition

43.8%

42 of 96 rated 7-9

Fair condition

50%

48 of 96 rated 5-6

Poor condition

6.3%

6 of 96 rated 4 or below

In-state Poor-share rank

#41 of 64

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

Condition distribution

Share of 96 NBI-tracked bridges by lowest applicable component rating.

Good
43.8% (42)
Fair
50% (48)
Poor
6.3% (6)

Routt County's Poor-condition bridges carry 11,736 vehicle crossings a day

That is 6.5% of the county's reported daily bridge traffic on 6.3% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 1,956 crossings a day against 1,156 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 96 of 96 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

19.8% of Routt County's bridges have passed the 50-year mark

19 of the 96 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 43.8% 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 54.5% of the county's Poor-condition bridge traffic

US 40 ML over SHELTON DITCH, built 1954, carries 6,400 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 6-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 11,736 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Routt County's bridges were built

96 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 30 of the county's bridges still in the inventory were built, which is 31.3% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1984) matches the Colorado average (1982).

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

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

The 5 Colorado counties nearest Routt County in number of bridges, with their condition splits. Its 6.3% Poor share is the 4th-lowest of these 6. Its average build year of 1984 against a peer-group mean of 1978 is 6 years newer.

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

Bridge inventory size and condition shares for Routt County and the 5 Colorado counties closest to it in inventory size
County Bridges Poor
Baca County 106 5.7%
La Plata County 102 2%
Gunnison County 100 7%
Routt County (this page) 96 6.3%
Huerfano County 94 6.4%
Grand County 88 5.7%

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

Similar inventory size

Nearest county inventories outside CO (96 bridges here).

Similar average build year

Nearest mean year-built outside CO (1984 here).

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

All 96 Good 42 Fair 48 Poor 6

Good-condition bridges (42)

County Road 36

Good

Over: Soda Creek

1.8 Mi N of Amethyst Dr, Routt, CO

Built 1979 Load: 12.2 t ADT: 922

NFSR 503.1

Good

Over: KING SOLOMON CREEK

1.2 MI. S OF NFSR 550.1, Routt, CO

Built 1982 Load: 17.5 t ADT: 50

County Road 39

Good

Over: Oak Creek

0.2 Mi S of Co Rd 35, Routt, CO

Built 1984 Load: 19.4 t ADT: 39

NFSR 443.1

Good

Over: MIDDLE FORK ELK RIVER

0.2 MI. S. OF NFSR 400.1, Routt, CO

Built 1975 Load: 22.0 t ADT: 50

NFSR 440.1

Good

Over: MIDDLE FORK ELK RIVER

0.2 MILE S. OF NFSR 400.1, Routt, CO

Built 1980 Load: 24.0 t ADT: 106

County Road 33

Good

Over: Trout Creek

.3 Mi NE of CR 179, Routt, CO

Built 2010 Load: 24.9 t ADT: 277

County Road 67

Good

Over: S Fk Williams Fk River

2.9 Mi S of Co Rd 29, Routt, CO

Built 2018 Load: 25.9 t ADT: 29

Pine Street

Good

Over: Soda Creek

250 Feet NW of 9TH Street, Routt, CO

Built 2006 Load: 26.7 t ADT: 637

SH 131 ML

Good

Over: YAMPA RIVER

5.5 MI S. OF STMBT SPRNGS, Routt, CO

Built 1976 Load: 28.1 t ADT: 4,600

Yahmonite Road

Good

Over: Soda Creek

40 ft NW of 9th Street, Routt, CO

Built 2008 Load: 28.2 t ADT: 1,929

County Road 67

Good

Over: S F Williams Fork River

0.7 Mi S of Co Rd 29, Routt, CO

Built 1992 Load: 29.1 t ADT: 31

South Shield Drive

Good

Over: Yampa River

0.3 Mi S of US Hwy 40, Routt, CO

Built 1993 Load: 29.6 t ADT: 2,672

NFSR 400.1

Good

Over: NORTH FORK ELK RIVER

8 MILES EAST OF CLARK CO, Routt, CO

Built 1956 Load: 29.8 t ADT: 106

County Road 58

Good

Over: Elk River

0.4 Mi W of Co Rd 129, Routt, CO

Built 1991 Load: 29.8 t ADT: 35

County Road 74

Good

Over: Elkhead Creek

2 Mi E of County Rd 76, Routt, CO

Built 1997 Load: 30.4 t ADT: 5

COUNTY ROAD 1W

Good

Over: Slater Creek

0.3 MI S of CO Rd 82, Routt, CO

Built 2012 Load: 32.3 t ADT: 24

US 40 ML

Good

Over: E FORK ELK RIVER

7 MI W OF STMBT. SPRINGS, Routt, CO

Built 2013 Load: 32.4 t ADT: 5,700

County Road 27

Good

Over: Trout Creek

4.0 Mi NW of St Hwy 131, Routt, CO

Built 2000 Load: 32.7 t ADT: 607

County Road 129

Good

Over: Hot Spring Creek

4.9 Mi N of US Hwy 40, Routt, CO

Built 1996 Load: 32.7 t ADT: 2,812

SH 131 ML

Good

Over: YAMPA RIVER

9.2 MI NO OF JCT SH 134, Routt, CO

Built 1989 Load: 32.7 t ADT: 1,500

NFSR 44.1

Good

Over: N.FORK ELK RIVER

~ 2 MI SSW OF DIAMOND PK, Routt, CO

Built 2000 Load: 33.4 t ADT: 19

County Road 67

Good

Over: S Fk Williams Fk River

7.1 Mi S of Co Rd 29, Routt, CO

Built 1994 Load: 33.4 t ADT: 22

County Road 67

Good

Over: S Fk Williams Fk River

6.3 Mi S of Co Rd 29, Routt, CO

Built 2019 Load: 33.7 t ADT: 23

County Road 18C

Good

Over: Yampa River

0.3 Mi E of Co Rd 18, Routt, CO

Built 2001 Load: 35.4 t ADT: 257

County Road 67

Good

Over: Williams Fork River

0.3 Mi S of Co Rd 29, Routt, CO

Built 2016 Load: 35.6 t ADT: 31

County Road 33A

Good

Over: Yampa River

0.2 Mi So of US Hwy 40, Routt, CO

Built 1986 Load: 36.0 t ADT: 176

County Road 76

Good

Over: Elkhead Creek

5.4 Mi N of US Hwy 40, Routt, CO

Built 1999 Load: 36.8 t ADT: 31

US 40 ML

Good

Over: YAMPA RIVER

5.0 MI EAST OF HAYDEN, Routt, CO

Built 1989 Load: 36.8 t ADT: 5,100

County Road 42

Good

Over: Elk River

0.9 Mi W of Co Rd 44, Routt, CO

Built 1989 Load: 38.8 t ADT: 222

13th Street

Good

Over: Yampa River

300 ft SW of US Hwy 40, Routt, CO

Built 1986 Load: 39.2 t ADT: 3,908

County Road 27

Good

Over: Mine Access

1 Mi S of CR 33, Routt, CO

Built 2010 Load: 40.2 t ADT: 864

County Road 24

Good

Over: Walton Creek

0.3 Mi E of US Hwy 40, Routt, CO

Built 1998 Load: 40.5 t ADT: 108

County Road 129

Good

Over: Big Creek

7.3 Mi. N. of U.S. 40, Routt, CO

Built 1999 Load: 41.8 t ADT: 2,652

5th Street

Good

Over: Yampa River

20 ft S of Yampa Street, Routt, CO

Built 1989 Load: 44.5 t ADT: 4,967

County Road 24

Good

Over: Priest Creek

0.4 Mi E of US Hwy 40, Routt, CO

Built 1998 Load: 44.7 t ADT: 108

County Road 205

Good

Over: Yampa River

0.3 Mi So of US Hwy 40, Routt, CO

Built 2006 Load: 44.7 t ADT: 475

County Road 22

Good

Over: Yampa River

0.4 Mi W of St Hwy 131, Routt, CO

Built 1984 Load: 45.6 t ADT: 660

County Road 64

Good

Over: Hinman Creek

5.0 Mi NE of Co Rd 129, Routt, CO

Built 1980 Load: 46.1 t ADT: 324

US 40 ML

Good

Over: Sage Creek

5 mi. E of Hayden, Routt, CO

Built 2015 Load: 48.0 t ADT: 5,100

CO RD 82

Good

Over: SLATER CREEK

9.2 M E OF MOFFAT CO LINE, Routt, CO

Built 2012 Load: 59.3 t ADT: 13

County Road 16

Good

Over: Morrison Creek

11.5 Mi SE of Co Rd 14, Routt, CO

Built 2007 Load: 75.5 t ADT: 83

County Road 129

Good

Over: Willow Creek

22.1 Mi N of US Hwy 40, Routt, CO

Built 1993 Load: 78.6 t ADT: 1,281

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
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.