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Every bridge in Siskiyou County, California

Name: Every bridge in Siskiyou County, California
Creator: Bridge Report Card
License: https://creativecommons.org/publicdomain/zero/1.0/

425 inventoried bridges, busiest first

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Siskiyou County, California, has 425 bridges in the 2025 National Bridge Inventory: 170 rated good, 230 fair, and 25 poor (as of August 20, 2026).
This index lists every one of them, busiest first; each links to its own condition record.

Bridge	Built	Vehicles/day	Condition
Interstate 5 NB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 SB over UP RR & Amtrak	1964	20,000	Fair
Interstate 5 over Mott Road	1976	20,000	Good
Interstate 5 over Mott Road	1976	20,000	Fair
Interstate 5 over Dunsmuir Ave	1976	19,200	Good
Interstate 5 over Dunsmuir Ave	1960	18,000	Good
Interstate 5 over Dunsmuir Ave	1960	18,000	Fair
Interstate 5 over Little Castle Creek	1960	18,000	Fair
Interstate 5 over Oak Street	1960	18,000	Good
Interstate 5 over Panorama Road	1960	18,000	Poor
Interstate 5 over Sacramento UP RR Amtrak	1955	18,000	Good
Interstate 5 over Willow Street	1960	18,000	Good
U.S. Highway 97 over Corp RR	1982	18,000	Fair
Interstate 5 over Greenhorn Creek	1970	16,600	Good
Interstate 5 over Yreka Creek	1970	16,600	Fair
Interstate 5 over Yreka Creek	1970	16,600	Fair
Interstate 5 NB over Cottonwood Creek	1974	15,300	Fair
Interstate 5 NB over Hutton Creek	1974	15,300	Fair
Interstate 5 NB over UP RR & Amtrak	1973	12,750	Fair
Interstate 5 SB over UP RR & Amtrak	2021	12,750	Good
Interstate 5 NB over State Route 97	1973	12,300	Fair
Interstate 5 SB over State Route 97	1973	12,300	Fair
Interstate 5 over Deetz Road	1973	12,300	Fair
Interstate 5 over Deetz Road	1973	12,300	Fair
I 5 NB over E96-n5 Con Klamath River	1969	11,050	Fair
State Route 3 over Yreka Creek	1970	10,100	Good
Interstate 5 over Killgore Hills Road	1970	8,550	Good
Interstate 5 over Killgore Hills Road	1970	8,550	Good
Interstate 5 NB over Oberlin Road	1970	8,300	Fair
Interstate 5 NB over State Route 3	1970	8,300	Fair
Interstate 5 SB over Miner Street	1970	8,300	Fair
Interstate 5 SB over Oberlin Road	1970	8,300	Fair
Interstate 5 SB over State Route 3	1970	8,300	Fair
Interstate 5 over Guys Gulch	1969	8,300	Good
Interstate 5 over Guys Gulch	1969	8,300	Good
Interstate 5 over Julien Creek	1969	8,300	Good
Interstate 5 over Julien Creek	1969	8,300	Good
Interstate 5 over Moonlit Oaks Ave	1970	8,300	Fair
Interstate 5 over Moonlit Oaks Ave	1970	8,300	Fair
Route 5 over Miner Street	1970	8,300	Fair
S5-s89 & N89-s5 Cn over Interstate 5	1964	8,000	Fair
Interstate 5 NB over Corp RR & Siskiyou Ave	1967	7,850	Good
Interstate 5 SB over Corp RR & Siskiyou Ave	1967	7,850	Good
Interstate 5 over Cram Gulch	1969	7,850	Fair
Interstate 5 over Cram Gulch	1969	7,850	Fair
Interstate 5 over Shasta River	1960	7,800	Good
Interstate 5 over Shasta River	1960	7,800	Good
Interstate 5 NB over Henley Way	1974	7,650	Fair
Interstate 5 SB over Henley Way	1974	7,650	Fair
Interstate 5 NB over Truitman Lane	1969	7,550	Good
Interstate 5 SB over Truitman Lane	1969	7,550	Good
Interstate 5 NB over Corp RR & Edgewood Rd	1967	7,400	Good
Interstate 5 SB over Corp RR & Edgewood Rd	1967	7,400	Good
Interstate 5 over Parks Creek	1969	7,400	Fair
Interstate 5 over Parks Creek	1969	7,400	Good
Interstate 5 over Stewart Springs Road	1969	7,400	Good
Interstate 5 over Stewart Springs Road	1969	7,400	Good
I 5 SB over E96-n5 Con Klamath River	1969	7,300	Good
Interstate 5 SB over Cottonwood Creek	1974	7,300	Fair
Interstate 5 NB over Siskiyou Way	1973	7,150	Fair
Interstate 5 NB over South Weed Blvd	1973	7,150	Fair
Interstate 5 NB over State Route 265	1973	7,150	Good
Interstate 5 SB over Siskiyou Way	1973	7,150	Fair
Interstate 5 SB over South Weed Blvd	1973	7,150	Fair
Interstate 5 SB over State Route 265	1973	7,150	Fair
Interstate 5 NB over Shasta River	1970	7,050	Fair
Interstate 5 SB over Klamath River Road	1970	7,050	Good
Interstate 5 SB over Shasta River	1970	7,050	Fair
Interstate 5 over Klamath River Road	1970	7,050	Good
Dunsmuir Avenue over Sacramento UP RR Amtrak	1966	5,000	Fair
U.S. Highway 97 over Whitney Creek	1982	5,000	Fair
U.S. Highway 97 over Sheep Rock Cattlepass	1976	3,250	Fair
State Route 3 over Moffett Creek	2021	2,900	Good
State Route 3 over Shasta River	1959	2,900	Good
State Route 3 over Kidder Creek	1956	2,825	Fair
State Route 3 over Kidder Creek	1956	2,825	Fair
State Route 3 over Patterson Creek	1962	2,825	Fair
State Route 3 over Scott River	1956	2,750	Fair
Hwy 99-97 Cutoff over Shasta River	1955	2,685	Good
Lassen Lane over Interstate 5	1964	2,650	Fair
99-97 Cutoff over Interstate 5	1969	2,515	Fair
State Route 89 over Mud Creek	2018	2,400	Good
Hilt Road over Interstate 5	2017	2,000	Good
Second Avenue over Indian Creek	1966	1,936	Fair
Walters Road over Interstate 5	1970	1,915	Good
Abrams Lake Road over Interstate 5 NB	1973	1,894	Fair
Abrams Lake Road over Interstate 5 SB	1973	1,894	Fair
Oberlin Rd (yreka) over Yreka Creek	1959	1,839	Good
Ream Ave over Interstate 5	1964	1,800	Good
S5-n Mt Shasta Off over Interstate 5	1964	1,700	Fair
Lake St over Interstate 5	1964	1,468	Fair
Siskiyou Ave over Interstate 5	1966	1,400	Fair
Elk Creek Road over Klamath River	1953	1,392	Fair
Foothill Drive over Yreka Creek	1970	1,328	Good
Westside Rd over Yreka Creek	1993	1,328	Good
State Route 263 over Dry Gulch	1929	1,200	Fair
State Route 263 over Shasta River	1928	1,200	Fair
State Route 263 over Shasta River	1931	1,200	Fair
State Route 263 over Shasta River	1931	1,200	Fair
Montague Grenada over Julien Creek	1974	1,153	Good
Montague Grenada over Shasta River	1972	1,148	Good
Bridge Street over Sacramento River	1965	1,104	Fair
S Mt Shasta-s5 on over Interstate 5	1964	1,100	Good
Fairlane Road over Yreka Creek	1970	1,081	Fair
Scott River Road over Moffett Creek	1962	1,032	Good
State Route 96 over Little Grider Creek	1967	1,013	Good
Old Highway 99 over Hay Creek	1923	1,005	Fair
Old Hwy 99 over Parks Creek	1994	1,005	Good
Old Hwy 99 over Willow Creek	1994	1,005	Fair
Old Hwy 99 South over Guys Gulch	2019	1,000	Fair
Old Hwy 99 South over Schulmeyer Gulch	2019	1,000	Fair
State Route 96 over Indian Creek	1962	1,000	Fair
State Route 263 over Klamath River	2021	990	Good
State Route 3 over Sugar Creek	1958	925	Good
State Route 3 over Wildcat Creek	1958	925	Fair
State Route 3 over Etna Creek	1959	880	Fair
State Route 3 over French Creek	1959	880	Fair
W. A. Barr Rd over Sacramento River	1968	864	Fair
Ager Road over Oregon Slough	1980	841	Fair
East-west Rd over Lost River	1984	827	Fair
State Route 96 over Empire Creek	1923	800	Fair
Ramp/connector 96 over Klamath River	1968	730	Good
State Route 161 over Lost River	2008	655	Fair
State Route 161 over Oregon Drain	1946	655	Fair
State Route 96 over Beaver Creek	1932	650	Good
State Route 96 over Doggett Creek	1953	650	Good
State Route 96 over Klamath River	1953	650	Fair
State Route 96 over Kohl Creek	1953	650	Good
State Route 96 over Lumgrey Creek	1923	650	Fair
Ager Rd over Black Mountain Gulch	1980	648	Fair
Curly Jack Road over Elk Creek	1975	624	Fair
Ager Rd over Klamath River Corp RR	1976	617	Good
State Route 96 over Fort Goff Creek	2015	615	Good
State Route 96 over Seiad Creek	1953	615	Good
State Route 96 over Thompson Creek	1952	615	Poor
Highway 96 over Oneil Creek	2008	600	Good
State Route 96 over Klamath River	1954	600	Good
State Route 96 over Scott River	1957	600	Poor
Yreka Ager Rd over Shasta River	1969	536	Good
Azalea Road over Interstate 5	1964	500	Good
Oregon St over Greenhorn Creek	1990	422	Good
State Route 96 over Irving Creek	1966	410	Good
State Route 96 over Klamath River	1970	410	Good
State Route 96 over Klamath River	1970	410	Good
State Route 96 over Salmon River	1974	410	Good
Butte St over Moffett Creek	1988	400	Good
Quartz Valley Road over Shackleford Creek	2005	400	Good
State Route 96 over Clear Creek	1966	400	Good
State Route 96 over Oak Flat Creek	1952	400	Good
Edgewood Rd over Shasta River	1969	395	Good
Edgewood Road over Shasta River	1973	395	Fair
Quartz Valley Road over Mill Creek	1980	395	Fair
Cram Gulch Rd over Schulmeyer Gulch	1972	391	Fair
Copco Road over Cottonwood Creek	1980	390	Good
N Old Stage Rd over Shasta River	1968	379	Poor
Henley-hornbrok Rd over Cottonwood Creek	1989	377	Fair
State Route 96 over Swillup Creek	2002	360	Good
Harry Cash Road over Little Shasta River	1920	353	Fair
State Route 3 over South Fork Scott River	1958	345	Fair
Quartz Valley Road over Shackleford Creek	1967	330	Fair
State Route 96 WB over Hillside	2009	330	Good
State Route 96 over Dillon Creek	1966	330	Fair
State Route 96 over Klamath River	1967	330	Fair
State Route 96 over Sandy Bar Creek	1942	330	Good
State Route 96 over Stanshaw Creek	1942	330	Fair
State Route 96 over Ti Creek	1967	330	Fair
Quartz Valley Road over Scott River	1967	329	Fair
Sawyers Bar Rd over Jackass Gulch	1968	323	Fair
Butterfly Ave over Sacramento River	1915	320	Fair
First Street over Sacramento River	1965	316	Good
Ager-beswich Rd over Willow Creek	1968	313	Good
Gazelle-callahan R over South Fork Willow Creek	1973	306	Fair
Rail Creek Road over East Fork Scott River	1998	300	Good
Elk Creek Road over Elk Creek	1967	293	Good
Gazelle-callahan R over Noyes Valley Creek	1972	287	Fair
Mcadams Creek Rd over Mcadams Creek	1975	256	Fair
Mcadams Creek Rd over Moffett Creek	1978	256	Fair
Salmon River Road over Merrill Creek	2002	250	Good
French CR Rd over French Creek	1986	245	Fair
French Creek Road over North Fork French Creek	1975	245	Fair
Copco Rd over Brush Creek	1976	226	Good
Copco Rd over Dry Creek	1960	226	Fair
Lake View Road over Klamath River	1960	226	Poor
East Callahan Road over East Fork Scott River	1956	213	Fair
Salmon River Road over Salmon River	1966	210	Poor
Diggles St over Moffett Creek	1988	200	Good
Hospital Road over Yreka Creek	1987	200	Poor
Klamath River Road over Klamath River	2014	200	Good
Horn Lane over Scott River	1956	194	Fair
State Route 3 over East Fork Scott River	1968	190	Fair
State Route 3 over East Fork Scott River	1968	190	Fair
State Route 3 over Mill Creek	1970	190	Fair
Scott River Road over Scott River	1967	186	Fair
Masterson Road over East Fork Scott River	1999	185	Good
Masterson Road over East Fork Scott River	1975	185	Good
Mastersons Road over Kangaroo Creek	1975	185	Good
Raymond St over Yreka Creek	1988	179	Good
Sacramento Ave over Sacramento River	1965	175	Fair
Eller Lane over Scott River	1910	172	Poor
Fairlane Rd over Juniper Creek	1923	171	Fair
Island Rd over Scott River Overflow	1986	170	Fair
Eddys Gulch Road over North Fork Salmon River	1968	167	Fair
Sawyers Bar Rd over Mill Creek	1982	167	Good
West St over Humbug Gulch	1965	165	Fair
Lwer Ltle Shsta Rd over Little Shasta River	1978	164	Fair
Serpa Lane over Kidder Creek	1967	164	Fair
Island Road over Scott River Overflow	1977	161	Fair
Island Road over Scott River Overflow	1977	158	Fair
Sawyers Bar Road over Kelly Gulch	2006	150	Good
Moffett Creek Rd over Moffett Creek	1989	145	Fair
Moffett Creek Rd over Moffett Creek	1975	145	Fair
Wyehka Way over Wagon Creek	1968	143	Fair
Indian Creek Road over East Fork Indian Creek	1967	142	Good
Fay Lane over Scott River	1975	136	Fair
Scott River Rd over Middle Creek	1900	135	Fair
Scott River Road over Scott River	1958	135	Good
Copco Road over Klamath River	1988	133	Good
Front St over Cottonwood Creek	2006	127	Good
Railroad Park Road over Little Castle Creek	1960	126	Fair
Walker Road Conn over Klamath River	1997	125	Fair
Cecilville Rd over Shadow Creek	1960	120	Fair
Cecilville Road over Black Bear Creek	1940	120	Fair
Cecilville Road over Crawford Creek	1960	120	Good
Cecilville Road over Hotelling Gulch	2022	120	Fair
Cecilville Road over Indian Creek	1940	120	Fair
Cecilville Road over Knownothing Creek	1987	120	Good
Cecilville Road over Mathews Creek	1940	120	Good
Cecilville Road over Mcneal Creek	1937	120	Fair
Cecilville Road over North Fork Salmon River	1985	120	Fair
Cecilville Road over South Fork Salmon River	1986	120	Fair
Cecilville Road over South Fork Salmon River	1987	120	Good
Cecilville Road over South Fork Scott River	1954	120	Fair
Jackson Ranch Rd over Carrick Creek	1982	120	Good
Sawyers Bar Rd over Little N Fk Salmon River	1968	120	Fair
Sawyers Bar Rd over North Fork Salmon River	1982	105	Fair
Sawyers Bar Rd over North Russian Creek	1968	105	Fair
Tennant Rd over Antelope Creek	1988	104	Good
Salmon River Rd over Butler Creek	1938	101	Fair
Ager Beswick Road over Bogus Creek	2002	100	Fair
Bailey Hill Road over Interstate 5	1974	100	Fair
Caribou Rd over South Fork Salmon River	1965	100	Fair
Caribou Road over E Fk of S Fk Salmon Riv	1965	100	Good
Ditch Creek Road over Interstate 5	1974	100	Fair
Edgewood Road over Shasta River	2009	100	Good
French Creek Rd over Duck Lake Creek	1987	100	Fair
Cottonwood CR Rd over Ditch Creek	1968	95	Fair
Grider Road over Grider Creek	1976	94	Fair
Peach Orchard Road over Moffett Creek	1920	94	Fair
Salmon River Road over Nordheimer Creek	1967	93	Fair
Anderson Grade Rd over Yreka Creek	1971	90	Fair
Island Road over Scott River Overflow	1977	86	Fair
Doolittle Creek Rd over Indian Creek	1965	79	Fair
Tennant Rd over Antelope Creek	1971	79	Fair
Scott River Rd over Deep Creek	1999	77	Good
No Data Entered over Mid Fk Applegate	2016	75	Good
Salmon River Road over Salmon River	1966	72	Fair
Eller Lane over Patterson Creek	1971	71	Fair
Walker Road over Barkhouse Creek	1969	68	Good
Walker Road over Little Humbug Creek	2000	68	Good
Tennant Rd over Butte Creek	1981	67	Good
West Louie Rd over Willow Creek	1989	65	Good
Miners Creek Road over French Creek	1967	62	Good
Miners Creek Road over Miners Creek	1968	62	Good
Anderson Grade Rd over Shasta River	1982	61	Good
I-5 Offrmp/klamath over Williams Creek	1969	60	Fair
Scarlett Way over Sacramento River	1970	59	Fair
W Moffett Creek Rd over Moffett Creek	1990	59	Good
S Fork Road over Indian Creek	1965	58	Fair
Yreka Walker Rd over Humbug Creek	1957	56	Fair
Antelope Ck Road over Butte Creek	1974	50	Fair
Auto Tour Road over Canal Turnout	1963	50	Fair
Bartle Gap over Moosehead Creek	1985	50	Good
Beaver Creek Road over Beaver Creek	1963	50	Fair
Beaver Creek Road over West Fork Beaver Creek	1972	50	Good
Benjamin Creek Rd over Doolittle Creek	1975	50	Fair
Blue Canyon Road over Butte Creek	1969	50	Fair
Boulder Road over East Boulder Creek	1966	50	Poor
Bridge Creek Road over Haypress Creek	1967	50	Good
Camp Eden Road over Duck Lake Creek	1949	50	Poor
Canyon Creek Road over Canyon Creek	1966	50	Good
Canyon Creek Road over Scott River	1958	50	Fair
China Grade Road over China Creek	1956	50	Good
China Grade Road over Horse Creek	2008	50	Good
China Mt. Road over Crater Creek	1974	50	Fair
China Mt. Road over Houston Creek	1974	50	Poor
Clear Creek Road over Clear Creek	1951	50	Good
Clear Creek Road over Fivemile Creek	1950	50	Good
Clear Creek Road over Fourmile Creek	1950	50	Good
Clear Creek Road over Wingate Creek	1951	50	Good
Copco Road over Jenny Creek	2008	50	Fair
Cow Creek over Mccloud River	1969	50	Fair
Deer Creek over Deer Creek	1975	50	Good
Elk Creek Road over Elk Creek	1949	50	Fair
Grayback Road over Indian Creek	1965	50	Fair
Grider Creek Road over Grider Creek	1966	50	Good
Horse Creek Road over Horse Creek	1959	50	Fair
Horse Creek Road over Seiad Creek	1956	50	Fair
Independence Road over Klamath River	1966	50	Good
Long John Road over Cow Creek	1958	50	Fair
Martin Dairy Road over Little Shasta River	1970	50	Fair
Mckinney Creek Rd over Mckinney Creek	1976	50	Good
Mill Ck Ridge Road over Mill Creek	1967	50	Good
Mill Ck Ridge Road over Trib to Mill Creek	1967	50	Good
Mill Creek Road over Mill Creek	1993	50	Fair
No Data Entered over Boulder Creek	2005	50	Good
No Data Entered over Cecil Creek	2004	50	Good
No Data Entered over E Fk S Fk Salmon River	2005	50	Good
No Data Entered over Kangaroo Creek	2006	50	Good
No Data Entered over Little Elk Creek	2004	50	Good
No Data Entered over Mill Creek	2003	50	Fair
No Data Entered over North Hungry Creek	2004	50	Good
No Data Entered over S Fk Scott River	2003	50	Good
No Data Entered over S Fk Taylor Creek	2005	50	Good
No Data Entered over Scott Bar Mill Creek	2003	50	Fair
No Data Entered over Scott Bar Mill Creek	2003	50	Good
No Data Entered over Sign Creek	2005	50	Good
No Data Entered over Trail Gulch	2005	50	Fair
No Data Entered over West Boulder Creek	2004	50	Poor
Raccoon Creek over Mccloud River	1955	50	Good
Red Hill over S. Fk. Sacramento River	1972	50	Good
Red Hill over Unnamed Creek	1982	50	Good
Road over Mid Fk Applegate	1951	50	Fair
Rock Shanty Road over Bark Shanty Gulch	1960	50	Good
Rock Shanty Road over Rock Creek	1966	50	Good
Sandy Bar Road over Ti Creek	1965	50	Fair
Seiad Creek Road over Seiad Creek	1959	50	Fair
Shackleford Ck Rd over Shackleford Creek	1992	50	Fair
Shovel Creek Road over Shovel Creek	1968	50	Fair
South Fork over So. Fk. Sacramento River	1966	50	Good
South Indian Road over S. Fork Indian Creek	1966	50	Fair
South Russian Road over Russian Creek	1966	50	Poor
Stouts Meadow over Mccloud River	1940	50	Fair
Toad Lake over Mid. Fk. Scramento River	1966	50	Fair
Tom Walker Road over Tompkins Creek	1988	50	Poor
Trapper Road over Trapper Creek	1978	50	Poor
Two Points Road over Singleton Creek	1996	50	Fair
Walker Creek Road over Walker Creek	1975	50	Fair
West Beaver Road over Jaynes Canyon	1976	50	Good
West Beaver Road over West Fork Beaver Creek	1983	50	Poor
Whiskey Creek over Tate Creek	1983	50	Good
Whites Gulch Road over North Fork Salmon River	1969	50	Good
Wrights Lake Road over Boulder Creek	1967	50	Fair
Yreka Headquarters over Yreka Creek	1975	50	Good
South Fork Road over South Fork Scott River	1969	49	Fair
Caribou Road over South Fork Salmon River	1984	48	Fair
Big Springs Road over Little Shasta River	1959	45	Fair
Louie Road over Shasta River	1935	45	Fair
Copco Rd over Fall Creek	1969	42	Fair
Mulloy Road over Willow Creek	1982	41	Fair
Sugar Creek Road over Miners Creek	1976	41	Fair
Willow Creek Rd over Willow Creek	1968	41	Fair
Louie Road over Interstate 5	1969	40	Fair
No Data Entered over Mill Creek	1975	40	Good
Pondosa Way over Bear Creek	1977	39	Good
Scott River Rd over Mcguffy Creek	1979	39	Fair
Scott River Rd over Tompkins Creek	1965	39	Good
York Road over Willow Creek	1930	39	Fair
Ager Beswick Rd over Shovel Creek	1977	37	Fair
Mill Creek Rd over Scott River	1985	37	Good
Island Road over Scott River Overflow	1989	35	Fair
No Data Entered over West Branch Indian Ck	2010	32	Good
Johnny Oneil Road over Horse Creek	1975	30	Good
No Data Entered over Elk Creek	1971	30	Poor
No Data Entered over Mill Creek	2000	30	Good
No Data Entered over Taylor Creek	1965	30	Fair
Road over Cook and Green	1957	30	Good
Shackleford Ck Rd over Big Meadows Creek	1982	30	Fair
Barkhouse Creek Rd over Barkhouse Creek	1998	29	Fair
Caribou Road over Rays Gulch	1982	29	Fair
Petersburg Rd over South Fork Salmon River	1969	29	Good
Petersburg Road over Cecil Creek	1967	29	Fair
Bal Mt & Sha Riv R over Little Shasta River	1988	28	Good
Bailey Hill Rd over Hutton Creek	1915	25	Fair
Whites Gulch Road over Whites Gulch	2009	25	Good
Hilt Hungry Road over Cottonwood Creek	1933	23	Fair
Klamath River Road over Vesa Creek	1974	23	Fair
Scott Mtn Rd over East Fork Scott River	1914	23	Fair
Bar Road over Klamath River	1998	21	Good
Horse CR Rd over Buckhorn Creek	1968	21	Good
Horse Creek Rd over Klamath River	1930	21	Poor
Horse Creek Road over Middle Creek	1971	21	Fair
Cold Bottle Spring over Little Shasta River	1970	20	Fair
Crag View Dr over Little Castle Creek	1917	20	Fair
Dennis Lane over Willow Creek	1969	20	Fair
French Creek Rd over French Creek	1990	20	Fair
Hawkinsvle Humb Rd over Humbug Creek	1971	20	Good
Independence Road over Independence Creek	1970	20	Poor
Klamath River Road over Humbug Creek	1975	20	Good
Methodist Ck Road over Methodist Creek	1966	20	Good
Methodist Ck Road over S. Fk. Salmon River	1963	20	Poor
No Data Entered over Horse Creek	1975	20	Good
South Russian Road over South Russian Creek	1968	20	Good
Wildcat Creek Road over Scott River	1909	20	Poor
Buker Road over Kelsey Creek	1984	15	Fair
Duzel Creek Rd over Duzel Creek	1974	15	Fair
Duzel Creek Rd over Moffett Creek	1971	15	Good
Fish Lake Road over E. Fork Salmon River	1966	15	Fair
Road over Elliott Creek	1969	15	Good
Road over Elliott Creek	1953	12	Fair
No Data Entered over Antelope Creek	1969	10	Fair
No Data Entered over Butte Creek	1965	10	Fair
No Data Entered over Doolittle Creek	1972	10	Fair
No Data Entered over Taylor Creek	1967	10	Fair
Old Cottonwood CR over Cottonwood Creek	1957	10	Poor
Road over Butte Fork Creek	1951	10	Poor
Road over Elliott Creek	1954	10	Fair
Road over Joe Creek	1954	10	Fair
Road over Mid Fk Applegate	1963	10	Poor
Road over Mid Fk Applegate	1969	10	Good
Slough Road over Interstate 5	1969	10	Fair
Boulder Creek Rd over Boulder Creek	1993	8	Good
Boulder Creek Rd over Canyon Creek	1993	8	Fair
Slough Rd over Lower Parks Creek	1975	7	Fair
Canyon Creek Rd over Scott River	1938	6	Fair
Grider Road over West Grider Creek	1971	6	Good
No Data Entered over Bear Creek	1990	5	Fair
No Data Entered over Bear Creek	1969	5	Fair
No Data Entered over Thompson Creek	1989	5	Fair
No Data Entered over West Fk Shadow Creek	1991	5	Fair
No Data Entered over Yet Atwam Creek	2022	5	Good
E Lennox St over Yreka Creek	1953	4	Fair
Scarface Rd over Moffett Creek	1967	4	Good
No Data Entered over S Fk Scott River	1995	3	Fair
No Data Entered over Boulder Creek	1967	2	Poor
Patrol Rd Unit 3A over Canal Turnout	1953	–	Fair

Source: FHWA National Bridge Inventory, 2025.

Siskiyou County bridge conditions · California bridges by county.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.