Total bridges
492
Public highway bridges in Shasta County
County profile · official public datasets
Shasta County, CA
492 public highway bridges tracked in the FHWA National Bridge Inventory: 47.6% rated Good, 49.4% Fair, 3% Poor.
- 492
- Public bridges
- 47.6%
- Good condition
- 3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Shasta County posts a top-10% lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 7%
- lowest Poor share in state
- 3%
- Poor-condition share
- 492
- public highway bridges
- 1967
- 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.
Shasta County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Shasta County ranks #4 of 58 California counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3%). Shasta County, California contains 492 public highway bridges. Roughly 47.6% are rated “Good,” 49.4% “Fair,” and 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
47.6%
234 of 492 rated 7-9
Fair condition
49.4%
243 of 492 rated 5-6
Poor condition
3%
15 of 492 rated 4 or below
In-state Poor-share rank
#4 of 58
Among California counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 492 NBI-tracked bridges by lowest applicable component rating.
Good 47.6% (234)
Fair 49.4% (243)
Poor 3% (15)
Shasta County's Poor-condition bridges carry 51,229 vehicle crossings a day
That is 1.8% of the county's reported daily bridge traffic on 3.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,415 crossings a day against 6,608 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 491 of 492 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
69.5% of Shasta County's bridges have passed the 50-year mark
342 of the 492 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 47.6% 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 35.1% of the county's Poor-condition bridge traffic
INTERSTATE 5 over CASTLE CREEK, built 1960, carries 18,000 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 15-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 51,229 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Shasta County's bridges were built
492 bridges with a recorded construction year, grouped by decade
- 1910s 8
1910–1919
8 bridges
- 1920s 19
1920–1929
19 bridges
- 1930s 38
1930–1939
38 bridges
- 1940s 39
1940–1949
39 bridges
- 1950s
1950–1959
55 bridges
- 1960s
1960–1969
134 bridges
- 1970s
1970–1979
74 bridges
- 1980s 39
1980–1989
39 bridges
- 1990s 32
1990–1999
32 bridges
- 2000s 29
2000–2009
29 bridges
- 2010s 17
2010–2019
17 bridges
- 2020s 8
2020–2029
8 bridges
What this shows Construction peaked in the 1960s, when 134 of the county's bridges still in the inventory were built, which is 27.2% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1967) matches the California average (1970).
How Shasta County compares with California's closest counties by inventory size
The 5 California counties nearest Shasta County in number of bridges, with their condition splits. Its 3% Poor share is the 1st-lowest of these 6. Its average build year of 1967 against a peer-group mean of 1965 is in line with the group.
Showing the 5 closest of 57 California counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Merced County | 528 | 32.2% | 59.5% | 8.3% | 1967 |
| Ventura County | 501 | 55.7% | 40.1% | 4.2% | 1969 |
| Shasta County (this page) | 492 | 47.6% | 49.4% | 3% | 1967 |
| Tehama County | 450 | 36.9% | 56.2% | 6.9% | 1961 |
| Imperial County | 444 | 50.7% | 40.5% | 8.8% | 1968 |
| Butte County | 437 | 31.8% | 62% | 6.2% | 1958 |
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 Shasta 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 Shasta County, both outside California so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside CA (492 bridges here).
- Lyon County, KS · 492 bridges
- Greene County, MO · 493 bridges
- Canadian County, OK · 493 bridges
- Vermilion County, IL · 494 bridges
Similar average build year
Nearest mean year-built outside CA (1967 here).
- Allegheny County, PA · avg 1967 · 1,294 bridges
- Suffolk County, MA · avg 1967 · 489 bridges
- Multnomah County, OR · avg 1967 · 473 bridges
- Le Flore County, OK · avg 1967 · 469 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (492)
NO DATA ENTERED
GoodOver: SLATE CREEK
NO DATA ENTERED, Shasta, CA
Built 2019 Load: 38.2 t ADT: 50
BALLS FERRY ROAD
GoodOver: ANDERSON CREEK
0.5 MI S DESCHUTES RD, Shasta, CA
Built 1935 Load: 38.9 t ADT: 2,727
COLLEGE VIEW DRIVE
GoodOver: CHURN CREEK
200 E HAWLEY RD, Shasta, CA
Built 1974 Load: 40.8 t ADT: 300
OAK RUN RD
GoodOver: LITTLE COW CREEK
1.1 MI S OF S.R. 299, Shasta, CA
Built 1981 Load: 41.5 t ADT: 220
STATE ROUTE 299
GoodOver: SALT CREEK
02-SHA-299-34.56, Shasta, CA
Built 1923 Load: 42.1 t ADT: 4,475
COLLYER ROAD
GoodOver: CHURN CREEK
200 E HAWLEY RD, Shasta, CA
Built 1974 Load: 42.4 t ADT: 300
DOTY ROAD
GoodOver: HAT CREEK
0.2 MI DUE EAST S.R. 89, Shasta, CA
Built 1971 Load: 42.4 t ADT: 200
LOCUST ST
GoodOver: A.C.I.D. CANAL
0.2 MI N ATHENS WAY, Shasta, CA
Built 1962 Load: 43.4 t ADT: 9,300
CASSEL ROAD
GoodOver: HAT CREEK
3.4 MI NE OF SR 89, Shasta, CA
Built 1930 Load: 44.4 t ADT: 230
WITHROW RD
GoodOver: SOUTH FORK BEAR CREEK
0.9 MI SE PONDEROSA RD, Shasta, CA
Built 1978 Load: 44.7 t ADT: 80
CASSEL ROAD
GoodOver: WEST FORK HAT CREEK
3.42 MI NE S.R. 89, Shasta, CA
Built 1930 Load: 45.7 t ADT: 230
OLD OREGON TRAIL
GoodOver: WEST FORK STILLWATER CRK
0.5 MI EAST OF I-5, Shasta, CA
Built 1968 Load: 46.3 t ADT: 1,220
BALLS FERRY ROAD
GoodOver: ANDERSON CREEK OVERFLOW
0.9 MI S DESCHUTES RD, Shasta, CA
Built 1969 Load: 46.3 t ADT: 2,780
CANYON RD
GoodOver: A.C.I.D. CANAL
0.2 MI SW OF SR 273, Shasta, CA
Built 1970 Load: 47.6 t ADT: 7,500
OLD HWY 44 DR
GoodOver: COW CREEK
0.5 MI N OF SR 44, Shasta, CA
Built 1955 Load: 48.9 t ADT: 2,178
PHILLIPS ROAD
GoodOver: LITTLE COW CREEK
1.6 MI SE BUZZARD RST RD, Shasta, CA
Built 1948 Load: 51.2 t ADT: 168
DESCHUTES ROAD
GoodOver: SACRAMENTO RIVER
1.0 MI S DERSCH RD, Shasta, CA
Built 1970 Load: 51.8 t ADT: 3,625
CHURN CREEK ROAD
GoodOver: STATE ROUTE 44
02-SHA-044-R0.38-RDG, Shasta, CA
Built 1985 Load: 53.8 t ADT: 15,800
SIMMONS ROAD
GoodOver: OLNEY CREEK
1 MI S PLACER RD, Shasta, CA
Built 1940 Load: 54.4 t ADT: 200
DOTY ROAD
GoodOver: HAT CREEK
1.0 MI NE OF SR 89, Shasta, CA
Built 1978 Load: 56.7 t ADT: 200
BOYLE RD
GoodOver: CLOUGH CREEK
2.5 MI W DESCHUTES RD, Shasta, CA
Built 1969 Load: 58.3 t ADT: 2,199
SODA CREEK ROAD
GoodOver: SODA CREEK
2.3 MI E OF I-5, Shasta, CA
Built 1975 Load: 59.6 t ADT: 80
UNION SCHOOL ROAD
GoodOver: WEST FORK STILLWATER CRK
0.2 MI W OLD OREGON TRAIL, Shasta, CA
Built 1968 Load: 60.6 t ADT: 1,175
FALLS AVENUE
GoodOver: SACRAMENTO RIVER
EAST OF I-5 NEAR SWETBRIR, Shasta, CA
Built 1974 Load: 66.7 t ADT: 100
FRISBY RD
GoodOver: CEDAR CREEK
0.4 MI S OF S.R. 299, Shasta, CA
Built 1960 Load: 66.7 t ADT: 100
JIM DAY ROAD
GoodOver: PIT RIVER
0.4 MI S/E OF SR 299, Shasta, CA
Built 1973 Load: 99.8 t ADT: 200
STATE ROUTE 36
GoodOver: HARRISON GULCH
02-SHA-036-3.56, Shasta, CA
Built 1952 Load: 99.9 t ADT: 475
SHOTGUN CREEK
PoorOver: UNNAMED CREEK
NO DATA ENTERED, Shasta, CA
Built 1946 ADT: 50
SPRING CREEK RD
PoorOver: FALL RIVER
0.5 MI N OF MCARTHUR RD, Shasta, CA
Built 1950 Load: 2.7 t ADT: 50
ISLAND ROAD
PoorOver: LITTLE TULE RIVER
2.3 MI N OF ARTHUR RD, Shasta, CA
Built 1950 Load: 13.3 t ADT: 100
STATE ROUTE 89
PoorOver: LAKE BRITTON
02-SHA-089-29.19, Shasta, CA
Built 1938 Load: 15.6 t ADT: 1,700
MIDDLE CREEK RD
PoorOver: MIDDLE CREEK
0.7 MI E OF IRON MTN RD, Shasta, CA
Built 1925 Load: 15.6 t ADT: 61
PARKVILLE RD
PoorOver: ASH CREEK
3.4 MI S DERSCH RD, Shasta, CA
Built 1958 Load: 17.8 t ADT: 130
GAS POINT RD OC
PoorOver: INTERSTATE 5
02-SHA-005-0.91, Shasta, CA
Built 1964 Load: 24.9 t ADT: 3,000
STATE ROUTE 299
PoorOver: WHISKEY CREEK(WSKYTWN LK
02-SHA-299-14.17, Shasta, CA
Built 1961 Load: 26.6 t ADT: 4,050
SMITH ROAD
PoorOver: INTERSTATE 5
02-SHA-005-R10.85, Shasta, CA
Built 1965 Load: 26.9 t ADT: 850
LOMA VISTA DR
PoorOver: INTERSTATE 5
02-SHA-005-R12.92-RDG, Shasta, CA
Built 1965 Load: 32.1 t ADT: 3,000
EMILY RD
PoorOver: ANDERSON CREEK
EMILY RD 300 FT E OF S ST, Shasta, CA
Built 1980 Load: 32.4 t ADT: 958
BRIDGE BAY ROAD
PoorOver: INTERSTATE 5
02-SHA-005-R27.63, Shasta, CA
Built 1968 Load: 35.6 t ADT: 880
INTERSTATE 5
PoorOver: CASTLE CREEK
02-SHA-005-63.31, Shasta, CA
Built 1960 Load: 37.6 t ADT: 18,000
INTERSTATE 5
PoorOver: CASTLE CREEK ROAD
02-SHA-005-63.58, Shasta, CA
Built 1960 Load: 40.5 t ADT: 18,000
SWEETBRIER AVE
PoorOver: INTERSTATE 5
02-SHA-005-61.75, Shasta, CA
Built 1962 Load: 45.7 t ADT: 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.