Total bridges
88
Public highway bridges in Grand County
County profile · official public datasets
Grand County, CO
88 public highway bridges tracked in the FHWA National Bridge Inventory: 43.2% rated Good, 51.1% Fair, 5.7% Poor.
- 88
- Public bridges
- 43.2%
- Good condition
- 5.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Grand County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- 37th
- of 64 on Poor share
- 5.7%
- Poor-condition share
- 88
- public highway bridges
- 1986
- 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.
Grand County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Grand County ranks #37 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.7%). Grand County, Colorado contains 88 public highway bridges. Roughly 43.2% are rated “Good,” 51.1% “Fair,” and 5.7% “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
43.2%
38 of 88 rated 7-9
Fair condition
51.1%
45 of 88 rated 5-6
Poor condition
5.7%
5 of 88 rated 4 or below
In-state Poor-share rank
#37 of 64
Among Colorado counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 88 NBI-tracked bridges by lowest applicable component rating.
Good 43.2% (38)
Fair 51.1% (45)
Poor 5.7% (5)
Grand County's Poor-condition bridges carry 20,042 vehicle crossings a day
That is 10.3% of the county's reported daily bridge traffic on 5.7% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 4,008 crossings a day against 2,194 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 88 of 88 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
22.7% of Grand County's bridges have passed the 50-year mark
20 of the 88 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 43.2% 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 54.9% of the county's Poor-condition bridge traffic
US 40 ML over CROOKED CREEK, built 1941, carries 11,000 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 5-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 20,042 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Grand County's bridges were built
88 bridges with a recorded construction year, grouped by decade
- 1920s 1
1920–1929
1 bridges
- 1930s 3
1930–1939
3 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s 7
1950–1959
7 bridges
- 1960s 5
1960–1969
5 bridges
- 1970s 4
1970–1979
4 bridges
- 1980s
1980–1989
20 bridges
- 1990s
1990–1999
23 bridges
- 2000s
2000–2009
10 bridges
- 2010s
2010–2019
11 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1990s, when 23 of the county's bridges still in the inventory were built, which is 26.1% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1986) matches the Colorado average (1982).
How Grand County compares with Colorado's closest counties by inventory size
The 5 Colorado counties nearest Grand County in number of bridges, with their condition splits. Its 5.7% Poor share is the 1st-lowest of these 6. Its average build year of 1986 against a peer-group mean of 1975 is 11 years newer.
Showing the 5 closest of 63 Colorado counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Routt County | 96 | 43.8% | 50% | 6.3% | 1984 |
| Huerfano County | 94 | 30.9% | 62.8% | 6.4% | 1975 |
| Grand County (this page) | 88 | 43.2% | 51.1% | 5.7% | 1986 |
| Elbert County | 85 | 11.8% | 82.4% | 5.9% | 1968 |
| Chaffee County | 84 | 28.6% | 65.5% | 6% | 1973 |
| Moffat County | 80 | 28.8% | 65% | 6.3% | 1973 |
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 Grand 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 Grand County, both outside Colorado so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CO (88 bridges here).
- Chicot County, AR · 88 bridges
- Prairie County, AR · 88 bridges
- Spalding County, GA · 88 bridges
- Boise County, ID · 88 bridges
Similar average build year
Nearest mean year-built outside CO (1986 here).
- El Paso County, TX · avg 1986 · 783 bridges
- Caddo County, LA · avg 1986 · 682 bridges
- Polk County, IA · avg 1986 · 545 bridges
- Canadian County, OK · avg 1986 · 493 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (38)
GRAND AVENUE
GoodOver: NORTH INLET
E end of Grand Avenue, Grand, CO
Built 2001 Load: 15.3 t ADT: 351
NO DATA ENTERED
GoodOver: WILLIAMS FORK
T25N R77W SECTION 31, Grand, CO
Built 1969 Load: 20.0 t ADT: 11
County Road 3
GoodOver: Williams Fork River
4.9 mi South of US Hwy 40, Grand, CO
Built 2019 Load: 22.7 t ADT: 569
SH 9 ML
GoodOver: COLORADO RIVER
S EDGE OF KREMMLING, Grand, CO
Built 2004 Load: 23.6 t ADT: 3,500
142.1
GoodOver: S.F. WILLIAMS FORK RIVER
NO DATA ENTERED, Grand, CO
Built 1968 Load: 26.6 t ADT: 50
NFSR 112
GoodOver: WILLOW CREEK
WEST OF ST HWY 125 MP9, Grand, CO
Built 1963 Load: 28.1 t ADT: 41
US 40 ML
GoodOver: TROUBLESOME CREEK
4.62 MI E OF JCT SH9, Grand, CO
Built 1996 Load: 29.2 t ADT: 2,400
US 40 ML
GoodOver: BIG MUDDY CREEK
IN KREMMLING, Grand, CO
Built 1996 Load: 29.2 t ADT: 3,100
SH 9 ML
GoodOver: WILDLIFE UNDERPASS
11.1 miles south of US-40, Grand, CO
Built 2017 Load: 32.4 t ADT: 3,600
SH 9 ML
GoodOver: WILDLIFE UNDERPASS/WASH
8.1 miles south of US-40, Grand, CO
Built 2017 Load: 32.4 t ADT: 1,200
SH 9 ML
GoodOver: WILDLIFE UNDERPASS
7.3 MI. S. O F US HWY 40, Grand, CO
Built 2017 Load: 32.4 t ADT: 3,600
SH 9 ML
GoodOver: WILDLIFE UNDERPASS/WASH
6.4 miles south of US-40, Grand, CO
Built 2017 Load: 32.4 t ADT: 3,600
SH 9 ML
GoodOver: WILDLIFE UNDERPASS
2.8 miles south of US-40, Grand, CO
Built 2017 Load: 32.4 t ADT: 3,600
County Road 84
GoodOver: Ranch Creek
Road to Meadow Creek Res, Grand, CO
Built 1992 Load: 32.7 t ADT: 533
Lions Gate Drive
GoodOver: Vasquez Creek
LIONS GATE/RENDVOU WY, Grand, CO
Built 1996 Load: 32.7 t ADT: 703
US 40 ML
GoodOver: RED DIRT CREEK
_, Grand, CO
Built 1994 Load: 32.7 t ADT: 2,100
County Road 8
GoodOver: Fraser River
0.2 Mi East of US Hwy 40, Grand, CO
Built 2019 Load: 33.7 t ADT: 2,341
NO DATA ENTERED
GoodOver: WILLIAMS FORK
JUST EAST OF HORSESHOE CG, Grand, CO
Built 1950 Load: 34.3 t ADT: 50
US 40 ML
GoodOver: BIG MUDDY CREEK
15.9 MI SE OF JCT SH 14, Grand, CO
Built 1988 Load: 34.7 t ADT: 2,300
US 34 ML
GoodOver: COLORADO RIVER
3.6 MI NO OF GRANBY, Grand, CO
Built 1999 Load: 34.7 t ADT: 6,300
County Road 8315
GoodOver: Ranch Creek
0.6 Mi. No. of Co. Rd. 83, Grand, CO
Built 1991 Load: 35.2 t ADT: 111
MORGAN GULCH REC S
GoodOver: Williams Fork River
0.2 mi from cnty rd 3, Grand, CO
Built 2011 Load: 35.3 t ADT: 25
US 40 ML
GoodOver: PEDESTRIAN UNDERPASS
.9 MI SE OF WINTER PARK, Grand, CO
Built 2004 Load: 35.5 t ADT: 11,000
County Road 66
GoodOver: Granby Pump Canal
Rd to Spillway, Grand, CO
Built 1991 Load: 35.9 t ADT: 458
US 34 ML
GoodOver: N FK COLORADO RIVER
11.9 MI NO OF JCT US 40, Grand, CO
Built 2018 Load: 36.6 t ADT: 6,200
US 40 ML
GoodOver: UP RR
E OF HOT SULPHUR SPRINGS, Grand, CO
Built 1987 Load: 36.9 t ADT: 3,400
US 40 ML
GoodOver: COLORADO RIVER
19.2 MI E OF JCT SH 9, Grand, CO
Built 1987 Load: 38.4 t ADT: 3,400
FDR 108
GoodOver: WILLOW CREEK
0.01 MI. WEST OF HWY. 108, Grand, CO
Built 2000 Load: 39.5 t ADT: 25
County Road 64
GoodOver: Granby Pump Canal
Rd btwn Granby/Shadow Mtn, Grand, CO
Built 1995 Load: 39.7 t ADT: 604
US 40 ML
GoodOver: UP RR
6 MI E OF JCT SH 9, Grand, CO
Built 2004 Load: 40.2 t ADT: 2,300
County Road 620
GoodOver: Colorado River
0.1 Mi East of US Hwy 34, Grand, CO
Built 1989 Load: 44.5 t ADT: 224
Ski Idlewild Road
GoodOver: Fraser River
0.1 Mi E of Sawyer Cir., Grand, CO
Built 2020 Load: 50.5 t ADT: 257
Summit Trail
GoodOver: Colorado River
1.7 Mi N of HWY 34, Grand, CO
Built 2007 Load: 53.7 t ADT: 115
US 40 ML
GoodOver: Corral Creek
11.09 MI E OF JCT SH 9, Grand, CO
Built 2002 Load: 54.1 t ADT: 2,300
US 40 ML
GoodOver: ST LOUIS CREEK
AT NW END OF FRASER, Grand, CO
Built 1975 Load: 56.2 t ADT: 9,800
SH 125 ML
GoodOver: WILLOW CREEK
5.5 MI NO OF JCT US 40, Grand, CO
Built 2015 Load: 64.8 t ADT: 900
NFSR 121.1
GoodOver: WILLOW CREEK
Just S of NFSR 107, Grand, CO
Built 2011 Load: 97.2 t ADT: 15
US 40 ML
GoodOver: PASS CREEK
0.71 MI W OF JCT SH 134, Grand, CO
Built 1994 Load: 99.9 t ADT: 2,300
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.