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.
All bridges (88)
GUBBINS-JOHNSON AC
FairOver: BAKER CREEK
0.6 MILES WEST OF U.S. RO, Grand, CO
Built 1983 Load: 7.3 t ADT: 50
County Road 330
FairOver: Williams Fork River
Over Inlet to Reservoir, Grand, CO
Built 1929 Load: 9.9 t ADT: 166
FDR 106
FairOver: WILLOW CREEK
125 E OF CO HWY 125, Grand, CO
Built 1967 Load: 11.3 t ADT: 10
County Road 39
FairOver: Colorado River
0.8 Mi So of US Hwy 40, Grand, CO
Built 1953 Load: 14.5 t ADT: 86
COUNTY ROAD 40
FairOver: Willow Creek Spillway
8 mi from Granby CO, Grand, CO
Built 1953 Load: 15.6 t ADT: 50
SH 125 ML
FairOver: WILLOW CREEK
14.3 MI N OF US 40/GRANBY, Grand, CO
Built 1952 Load: 17.4 t ADT: 900
County Road 2
FairOver: Troublesome Creek
6.2 Mi North of US Hwy 40, Grand, CO
Built 1990 Load: 18.5 t ADT: 56
County Road 83
FairOver: Fraser River
Road to Meadow Creek Resv, Grand, CO
Built 1985 Load: 19.1 t ADT: 1,702
GUBBINS-JOHNSON AC
FairOver: COLORADO RIVER
0.3 MILES WEST OF U.S. RO, Grand, CO
Built 1983 Load: 20.0 t ADT: 25
County Road 11
FairOver: Sheephorn Creek
0.6 Mi East of Radium, Grand, CO
Built 1988 Load: 21.0 t ADT: 300
County Road 6
FairOver: Granby Dam Spillway
7.1 mi N of Granby CO, Grand, CO
Built 1950 Load: 24.9 t ADT: 400
US 40 ML
FairOver: COLORADO RIVER
14.8 MI E / SH 9 KREMLING, Grand, CO
Built 1974 Load: 25.3 t ADT: 2,600
US 40 ML
FairOver: FRASER RIVER
E. EDGE OF GRANBY, Grand, CO
Built 1985 Load: 26.1 t ADT: 11,000
NFSR 123
FairOver: PASS CREEK
EAST OF HWY 125 NEAR MP17, Grand, CO
Built 1967 Load: 26.6 t ADT: 94
COUNTY ROAD 663
FairOver: TONAHUTU CREEK
South from Kawuneeche Vis, Grand, CO
Built 1983 Load: 27.2 t ADT: 75
County Road 57
FairOver: Fraser River
Near Co. Animal Shelter, Grand, CO
Built 1980 Load: 28.3 t ADT: 275
Rendezvous Road
FairOver: Fraser River
0.12 MI E of US40, Grand, CO
Built 2006 Load: 28.6 t ADT: 997
SH 134 ML
FairOver: BIG ROCK CREEK
11.5 MI E OF TOPONAS, Grand, CO
Built 1955 Load: 28.8 t ADT: 320
FDR 125 SERVICE RD
FairOver: ARAPAHO CREEK
11.0 MI SOUTH OF US 34, Grand, CO
Built 1930 Load: 29.1 t ADT: 1
County Road 491
FairOver: Colorado River
E of Winding River Resort, Grand, CO
Built 1985 Load: 29.5 t ADT: 631
Grand Avenue
FairOver: Colorado River
50 W of Jct Grand/Pa, Grand, CO
Built 1984 Load: 30.2 t ADT: 756
County Road 804
FairOver: Fraser River
Just N of Safeway Store, Grand, CO
Built 1976 Load: 31.8 t ADT: 3,275
US 40 ML
FairOver: UP RR
0.7 MI W OF TABERNASH, Grand, CO
Built 1975 Load: 32.2 t ADT: 8,900
US 34 ML
FairOver: COLORADO RIVER OVFLW
3.4 MI NO OF GRANBY, Grand, CO
Built 1999 Load: 32.4 t ADT: 6,300
County Road 3
FairOver: Colorado River
Rd Williams Fk Reservoir, Grand, CO
Built 1992 Load: 32.6 t ADT: 1,230
County Road 1
FairOver: Sheephorn Creek
Just south of MP 15, Grand, CO
Built 1997 Load: 32.7 t ADT: 632
County Road 11
FairOver: Colorado River
0.1 Mi So of Radium, Grand, CO
Built 1989 Load: 32.7 t ADT: 80
Winter Park Drive
FairOver: Fraser River
Entrance to Trademark, Grand, CO
Built 1989 Load: 32.7 t ADT: 843
US 40 ML
FairOver: DIAMOND CREEK
5.6 MI SE OF JCT SH 14, Grand, CO
Built 2000 Load: 32.7 t ADT: 2,300
US 40 ML
FairOver: BIG MUDDY CREEK
7.5 MI SE JCT SH 14, Grand, CO
Built 1988 Load: 32.7 t ADT: 2,300
US 40 ML
FairOver: BIG MUDDY CREEK
8.7 MI SE OF JCT SH 14, Grand, CO
Built 1988 Load: 32.7 t ADT: 2,300
10 MILE DRIVE
FairOver: TENMILE CREEK
.6 miles W of US 40, Grand, CO
Built 2000 Load: 32.7 t ADT: 751
US 40 ML
FairOver: COLORADO RIVER
0.9 MI E OF JCT SH 125, Grand, CO
Built 1995 Load: 33.0 t ADT: 3,800
US 40 ML
FairOver: UP RR
EASTERN EDGE OF GRANBY, Grand, CO
Built 1985 Load: 35.2 t ADT: 11,000
County Road 73
FairOver: St. Louis Creek
0.9 Mi West of US Hwy 40, Grand, CO
Built 1981 Load: 35.9 t ADT: 817
County Road 1
FairOver: Blue River
0.75 Mi West of St Hwy 9, Grand, CO
Built 1990 Load: 36.3 t ADT: 1,259
WEST PORTAL DRIVE
FairOver: NORTH INLET
Road to Adams Falls, Grand, CO
Built 1950 Load: 37.2 t ADT: 924
US 40 ML
FairOver: VASQUEZ CREEK
IN WINTER PARK, Grand, CO
Built 1938 Load: 37.3 t ADT: 11,000
US 40 ML
FairOver: FRASER RIVER
1 MI SE OF WINTER PARK, Grand, CO
Built 1942 Load: 39.0 t ADT: 11,000
County Road 6
FairOver: Lake Grandby Buchanan C
East End of Lake Granby, Grand, CO
Built 1993 Load: 41.7 t ADT: 478
County Road 627
FairOver: Colorado River
1.4 Mi East of US Hwy 34, Grand, CO
Built 1999 Load: 44.8 t ADT: 4
Jericho Road
FairOver: Grand/Shadow Mtn Channel
100 S Jct w/Lakeside, Grand, CO
Built 1991 Load: 45.6 t ADT: 633
County Road 10
FairOver: Blue River
On Spring Creek Road, Grand, CO
Built 1993 Load: 46.7 t ADT: 150
County Road 25
FairOver: Muddy Creek
.4 Mi E US 40/N of Resvr, Grand, CO
Built 1996 Load: 48.2 t ADT: 22
County Road 57
FairOver: Colorado River
200 Ft South of US Hwy 40, Grand, CO
Built 1990 Load: 52.1 t ADT: 59
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
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.