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)
ROAD 32N12
FairOver: HAT CREEK
NO DATA ENTERED, Shasta, CA
Built 1956 ADT: 30
FENDER FERRY
FairOver: PIT RIVER/SHASTA LAKE
NO DATA ENTERED, Shasta, CA
Built 1942 ADT: 50
FENDER FERRY
FairOver: MCCLOUD RIVER/SHASTA LK.
MCCLOUD BRIDGE CG, Shasta, CA
Built 1941 ADT: 50
FORKS FLAT
FairOver: NORTH FORK NOSONI CREEK
NO DATA ENTERED, Shasta, CA
Built 1990 ADT: 50
SIMS MTN.
FairOver: HAZEL CREEK
NO DATA ENTERED, Shasta, CA
Built 1955 ADT: 50
LOWER GAS POINT RD
FairOver: NORTH FORK COTTONWOOD CR
0.5 MI N OF GAS PONT ROAD, Shasta, CA
Built 1920 Load: 11.3 t ADT: 10
FENDER FERRY
FairOver: DOG CREEK
NO DATA ENTERED, Shasta, CA
Built 1917 Load: 11.3 t ADT: 50
SODA CREEK ROAD
FairOver: SODA CREEK
3.0 MI EAST OF I-5, Shasta, CA
Built 1930 Load: 11.7 t ADT: 2
ROUTE 11
FairOver: UPPER CLEAR CREEK
0.2 miles N of Hwy 299 (M, Shasta, CA
Built 1940 Load: 12.7 t ADT: 30
SERVICE ROAD
FairOver: CRYSTAL CREEK
0.1 miles S of Hwy 299 (M, Shasta, CA
Built 1940 Load: 12.7 t ADT: 50
ADOBE RD
FairOver: ANDERSON CREEK
3.4 MI SE BALLS FERRY RD, Shasta, CA
Built 1968 Load: 13.6 t ADT: 10
PLATINA RD
FairOver: HULING CREEK
P.M. 25.1 E FROM SR 36, Shasta, CA
Built 1924 Load: 14.3 t ADT: 610
CORAM ROAD
FairOver: COTTONWOOD CREEK
1.75 MI E OF SHASTA DAM, Shasta, CA
Built 2006 Load: 14.6 t ADT: 50
CHURN CREEK RD
FairOver: CHURN CREEK
0.75 MI W AIRPORT RD, Shasta, CA
Built 1952 Load: 15.2 t ADT: 2,000
ASH CR RD
FairOver: SACRAMENTO RIV OVERFLOW
1.0 MI E BALLS FERRY RD, Shasta, CA
Built 1927 Load: 15.2 t ADT: 850
ROUTE 20
FairOver: LOWER CLEAR CREEK
1.5 miles SW of Hwy 299 (, Shasta, CA
Built 1955 Load: 15.4 t ADT: 20
JACK RABIT FLAT RD
FairOver: BURNEY CREEK
0.1 MI S SH 299, Shasta, CA
Built 1989 Load: 15.6 t ADT: 23
SOUTH SHORE DRIVE
FairOver: BOULDER CREEK
3.5 miles south of Hwy 29, Shasta, CA
Built 1996 Load: 15.6 t
HILL BLVD
FairOver: CHURN CREEK
0.1 MI N LAKE BLVD, Shasta, CA
Built 1940 Load: 16.2 t ADT: 200
FRENCH GULCH ROAD
FairOver: FRENCH GULCH
2.3 MI NW/O TRINITY MT RD, Shasta, CA
Built 1935 Load: 16.2 t ADT: 60
LOWER GAS POINT RD
FairOver: LUCILLE CREEK
1.2 MI N GAS POINT RD, Shasta, CA
Built 1935 Load: 16.2 t ADT: 10
ASH CREEK ROAD
FairOver: ASH CREEK TRIBUTARY
1.8 MI E PARKVILLE RD, Shasta, CA
Built 1945 Load: 16.2 t ADT: 200
ASH CR RD
FairOver: ASH CREEK TRIBUTARY
2.2 MI E PARKVILLE RD, Shasta, CA
Built 1940 Load: 16.2 t ADT: 200
SHOTGUN ROAD
FairOver: SHOTGUN CREEK
02-SHA-005-R55.59, Shasta, CA
Built 1915 Load: 16.5 t ADT: 10
CLARK CREEK ROAD
FairOver: BURNEY CREEK
0.5 MI NW OF SR 89, Shasta, CA
Built 1930 Load: 16.5 t ADT: 359
OAK RUN ROAD
FairOver: OAK RUN CREEK
6.6 MI S OF SR 299, Shasta, CA
Built 1912 Load: 17.2 t ADT: 530
SODA CREEK ROAD
FairOver: S FORK SODA CREEK
2 MI E OF I-5, Shasta, CA
Built 1960 Load: 17.2 t ADT: 80
PONDEROSA RD
FairOver: SOUTH FORK BEAR CREEK
2.0 MI N OF S.R. 44, Shasta, CA
Built 1930 Load: 17.2 t ADT: 90
MOINE ROAD
FairOver: SLATE CREEK
0.1 MI E SLATE CREEK RD, Shasta, CA
Built 1927 Load: 17.8 t ADT: 52
TAMARACK ROAD
FairOver: OLD COW CREEK
0.5 MI E OF LUMBER RD, Shasta, CA
Built 2001 Load: 17.8 t ADT: 20
LAKE SHORE DRIVE
FairOver: CHARLIE CREEK
1.8 MI SW ANTLR UC ON I-5, Shasta, CA
Built 1926 Load: 18.1 t ADT: 1,383
DEER FLAT RD
FairOver: NORTH FORK BATTLE CREEK
0.3 MI E RITTS MILL RD, Shasta, CA
Built 1947 Load: 18.1 t ADT: 120
ROCK CR RD
FairOver: ROCK CREEK
0.4 MI N OF S.R. 299, Shasta, CA
Built 1960 Load: 18.1 t ADT: 1,144
INTERSTATE 5 NB
FairOver: EAST CYPRESS AVE
02-SHA-005-R14.44-RDG, Shasta, CA
Built 1965 Load: 18.5 t ADT: 26,500
PONDEROSA WAY
FairOver: NORTH FORK BEAR CREEK
6.4 MI N OF S.R. 44, Shasta, CA
Built 1935 Load: 18.5 t ADT: 87
DERSCH RD
FairOver: LACK CREEK
3.2 MI S OF S.R. 44, Shasta, CA
Built 1962 Load: 18.5 t ADT: 896
STEEL BRIDGE RD
FairOver: BULLHOCK CREEK
0.7 MI SE OF BATEMAN RD., Shasta, CA
Built 1995 Load: 18.5 t ADT: 10
INTERSTATE 5 SB
FairOver: EAST CYPRESS AVE
02-SHA-005-R14.44-RDG, Shasta, CA
Built 1965 Load: 18.8 t ADT: 26,500
BLAND ROAD
FairOver: NORTH FORK WILSON CREEK
2.32 MI S PLATINA RD, Shasta, CA
Built 1972 Load: 18.8 t ADT: 60
BEAR MOUNTAIN ROAD
FairOver: DEEP HOLE CREEK
100 FT S/O BERNARD WAY, Shasta, CA
Built 1940 Load: 18.8 t ADT: 2,632
SACRAMENTO DR
FairOver: OLNEY CREEK
0.5 MI E OF SR273, Shasta, CA
Built 1954 Load: 18.8 t ADT: 2,865
STATE ROUTE 151
FairOver: INTERSTATE 5
02-SHA-151-R6.90, Shasta, CA
Built 1968 Load: 19.8 t ADT: 11,150
MINERAL RD
FairOver: BAILEY CREEK
0.2 MI S OF SR 44, Shasta, CA
Built 1947 Load: 19.8 t ADT: 123
HOT SPRINGS RD
FairOver: JANEEN CREEK
0.4 MI W OF BIG BEND RD, Shasta, CA
Built 1940 Load: 19.8 t ADT: 50
LAKESHORE DRIVE
FairOver: DONEY CREEK
0.8 MI SW ANTLR UC ON I-5, Shasta, CA
Built 1927 Load: 20.1 t ADT: 2,178
MAIN STREET
FairOver: CASTLE CREEK
0.2 MI S CASTLE CR RD I-5, Shasta, CA
Built 1918 Load: 20.1 t ADT: 452
TURNTABLE BAY ROAD
FairOver: INTERSTATE 5 NB
02-SHA-005-R29.32R, Shasta, CA
Built 1968 Load: 20.4 t ADT: 400
ASH CR RD
FairOver: SACRAMENTO RIVER
1.2 MI E BALLS FERRY RD, Shasta, CA
Built 1970 Load: 20.4 t ADT: 850
PONDEROSA WAY
FairOver: SNOW CREEK
4.1 MI N OF S.R. 44, Shasta, CA
Built 1935 Load: 20.7 t ADT: 87
ROCK CREEK RD
FairOver: BAILEY CREEK
0.7 MI S OF SR 44, Shasta, CA
Built 1930 Load: 21.1 t ADT: 42
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.