Total bridges
47
Public highway bridges in Jackson County
County profile · official public datasets
Jackson County, CO
47 public highway bridges tracked in the FHWA National Bridge Inventory: 31.9% rated Good, 63.8% Fair, 4.3% Poor.
- 47
- Public bridges
- 31.9%
- Good condition
- 4.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Jackson County posts a better-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 47%
- lowest Poor share in state
- 4.3%
- Poor-condition share
- 47
- public highway bridges
- 1983
- 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.
Jackson County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Jackson County ranks #30 of 64 Colorado counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.3%). Jackson County, Colorado contains 47 public highway bridges. Roughly 31.9% are rated “Good,” 63.8% “Fair,” and 4.3% “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.
Good condition
31.9%
15 of 47 rated 7-9
Fair condition
63.8%
30 of 47 rated 5-6
Poor condition
4.3%
2 of 47 rated 4 or below
In-state Poor-share rank
#30 of 64
Among Colorado counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 47 NBI-tracked bridges by lowest applicable component rating.
Good 31.9% (15)
Fair 63.8% (30)
Poor 4.3% (2)
Jackson County's Poor-condition bridges carry 287 vehicle crossings a day
That is 1.7% of the county's reported daily bridge traffic on 4.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 144 crossings a day against 478 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 47 of 47 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
21.3% of Jackson County's bridges have passed the 50-year mark
10 of the 47 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 31.9% 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 62.4% of the county's Poor-condition bridge traffic
County Road 6W over Michigan River, built 1958, carries 179 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 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 287 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Jackson County's bridges were built
47 bridges with a recorded construction year, grouped by decade
- 1940s 2
1940–1949
2 bridges
- 1950s 4
1950–1959
4 bridges
- 1960s 3
1960–1969
3 bridges
- 1970s 6
1970–1979
6 bridges
- 1980s
1980–1989
17 bridges
- 1990s
1990–1999
7 bridges
- 2000s 4
2000–2009
4 bridges
- 2010s 3
2010–2019
3 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1980s, when 17 of the county's bridges still in the inventory were built, which is 36.2% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1983) matches the Colorado average (1982).
How Jackson County compares with Colorado's closest counties by inventory size
The 5 Colorado counties nearest Jackson County in number of bridges, with their condition splits. Its 4.3% Poor share is the 4th-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1977 is 6 years newer.
Showing the 5 closest of 63 Colorado counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Park County | 55 | 29.1% | 67.3% | 3.6% | 1975 |
| Rio Blanco County | 54 | 31.5% | 66.7% | 1.9% | 1980 |
| Yuma County | 49 | 51% | 44.9% | 4.1% | 1981 |
| Jackson County (this page) | 47 | 31.9% | 63.8% | 4.3% | 1983 |
| Archuleta County | 44 | 29.5% | 63.6% | 6.8% | 1976 |
| Saguache County | 41 | 48.8% | 43.9% | 7.3% | 1972 |
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 Jackson 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 Jackson County, both outside Colorado so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CO (47 bridges here).
- Juneau City and County, AK · 47 bridges
- Ben Hill County, GA · 47 bridges
- Long County, GA · 47 bridges
- Benewah County, ID · 47 bridges
Similar average build year
Nearest mean year-built outside CO (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (15)
NFSR 740.1
GoodOver: S. FORK MICHIGAN RIVER
3.1 MI S. OF S.H. 14, Jackson, CO
Built 1983 Load: 17.5 t ADT: 17
NFSR 615.1
GoodOver: NEWCOMB CREEK
3.8 MI N OF JCT 60/615, Jackson, CO
Built 2001 Load: 18.8 t ADT: 50
NFSR 496
GoodOver: ENCAMPMENT RIVER
3.7 MI. SE OF HOG PARK CG, Jackson, CO
Built 1967 Load: 24.3 t ADT: 216
NFSR 660.1
GoodOver: S. FORK BIG CREEK
AT BIG CREEK LAKE CG, Jackson, CO
Built 1977 Load: 26.2 t ADT: 48
County Road 18
GoodOver: North Platte River
0.1 Mi W of Co Rd 9, Jackson, CO
Built 1991 Load: 32.9 t ADT: 163
County Road 28
GoodOver: Buffalo Creek
2 MI E of St Hwy 14, Jackson, CO
Built 1989 Load: 32.9 t ADT: 45
SH 125 ML
GoodOver: NORTH PLATTE RIVER
16 MILES NORTH OF WALDEN, Jackson, CO
Built 1986 Load: 33.1 t ADT: 420
NFSR 106.1
GoodOver: EAST BRANCH WILLOW CREEK
1.4 MI INT 106 & SH 125, Jackson, CO
Built 2012 Load: 35.0 t ADT: 50
ROAD
GoodOver: MICHIGAN RIVER
NO DATA ENTERED, Jackson, CO
Built 2023 Load: 37.6 t ADT: 50
NFSR 780.1
GoodOver: S. FORK MICHIGAN RIVER
3.7 MI S. OF S.H. 14, Jackson, CO
Built 1984 Load: 43.1 t ADT: 17
County Road 6W
GoodOver: North Platte River
2.1 MI W of St Hwy 125, Jackson, CO
Built 2003 Load: 46.7 t ADT: 172
NFSR 770.1
GoodOver: S. FORK MIGHIGAN RIVER
4.5 MI. S. OF S.H. 14, Jackson, CO
Built 1966 Load: 48.3 t ADT: 17
SH 14 ML
GoodOver: GRIZZLY CREEK
8.5 MI NE OF JCT US 40, Jackson, CO
Built 2005 Load: 63.0 t ADT: 1,300
SH 125 ML
GoodOver: ILLINOIS RIVER
0.7 MI NORTH OF JCT SH 14, Jackson, CO
Built 1993 Load: 70.4 t ADT: 2,200
SH 125 ML
GoodOver: MICHIGAN RIVER
N. EDGE OF WALDEN, Jackson, CO
Built 2012 Load: 79.7 t ADT: 2,400
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.