Scour-Critical Bridges in Oregon

Oregon has 1,224 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

Bridge	County	Scour Rating	Daily Traffic	Condition
Barlow Trail RD over Hackett Creek	Clackamas	3 — Serious	165,900	Fair
I-5 (hwy 001) over Tualatin River	Washington	3 — Serious	156,016	Fair
HWY 064 over Columbia River	Multnomah	3 — Serious	148,936	Fair
HWY 064 (i-205) over Columbia R./so. Channel	Multnomah	3 — Serious	148,936	Fair
I-5 (hwy 1) over Oregon Slough	Multnomah	3 — Serious	125,775	Fair
HWY 061 over Willamette River	Multnomah	3 — Serious	103,251	Fair
HWY 064 over Willamette River	Clackamas	3 — Serious	97,105	Fair
WB Con To HWY 1 SB over HWY 1	Multnomah	3 — Serious	76,816	Fair
Hy 1 SB To Hy 2 EB over HWY 1 I-5	Multnomah	3 — Serious	71,767	Fair
HWY 001 NB over Columbia River	Multnomah	3 — Serious	65,013	Fair
HWY 001 SB over Columbia River	Multnomah	3 — Serious	65,013	Fair
HWY 064 NB over Clackamas River	Clackamas	3 — Serious	62,210	Fair
HWY 064 SB over Clackamas River	Clackamas	3 — Serious	62,210	Fair
1-105 (hwy 227) over Willamette River	Lane	3 — Serious	55,375	Fair
Morrison ST over Willamette River	Multnomah	3 — Serious	55,335	Fair
HWY 69 over Crow Creek	Lane	3 — Serious	55,046	Fair
I-5 (hwy 001) over Medford Viaduct	Jackson	3 — Serious	53,404	Fair
Barlow Trail RD over Clear Creek	Clackamas	3 — Serious	51,600	Fair
Or 22 (hwy 30) EB over Willamette River	Marion	3 — Serious	45,083	Fair
Or 99e(hwy 81) over Johnson Creek	Multnomah	3 — Serious	45,032	Fair
Or 22 (hwy 30) WB over Willamette River	Marion	3 — Serious	44,573	Fair
HWY 72 Mission ST over Mill Creek	Marion	3 — Serious	43,693	Fair
3rd Street over Central Oregon Canal	Deschutes	3 — Serious	42,538	Fair
State Street over Mill Creek	Marion	3 — Serious	40,878	Fair
State Street over Mill Creek	Marion	3 — Serious	40,878	Fair
HWY 69 (wb) over Willamette R & River AVE	Lane	3 — Serious	38,885	Fair
HWY 69 (eb) over Willamette R & River AVE	Lane	3 — Serious	38,885	Fair
I-5 (hwy 001) over Evans Creek	Jackson	3 — Serious	37,706	Fair
I-5 (hwy 001) over Ward Creek	Jackson	3 — Serious	37,706	Fair
Or 62 (hwy 022) over Bear Creek	Jackson	3 — Serious	36,121	Fair
Burnside Street over Willamette River	Multnomah	3 — Serious	35,000	Fair
W 11th AVE over Amazon Creek	Lane	3 — Serious	33,645	Good
I-5 (hwy 1) NB over Santiam Overflow No. 2	Marion	3 — Serious	33,486	Fair
I-5 (hwy 1) SB over Santiam Overflow No. 4	Linn	3 — Serious	33,446	Fair
I-5 (hwy 1) NB over Santiam Overflow No. 4	Linn	3 — Serious	33,446	Fair
I-5 (hwy 1) SB over Santiam Overflow No. 3	Marion	3 — Serious	33,446	Fair
I-5 (hwy 1) NB over Santiam Overflow No. 3	Marion	3 — Serious	33,446	Fair
Or 99e(hwy 001e) over Clackamas River	Clackamas	3 — Serious	33,434	Fair
Hawthorne AVE over Willamette River	Multnomah	3 — Serious	32,243	Fair
Or 34 (hwy 210) over Owl Creek	Linn	3 — Serious	32,045	Fair
HWY 72 over Mill Creek	Marion	3 — Serious	31,897	Fair
City Street 19t15 over Barnett Road At Bear CR	Jackson	3 — Serious	31,423	Fair
Broadway ST over Willamette River	Multnomah	3 — Serious	30,871	Fair
US 30 (hwy 92) over Honeyman Creek	Columbia	3 — Serious	30,567	Fair
HWY 69 (wb) over Willamette R Oflow WB	Lane	3 — Serious	29,662	Fair
Or 99e (hwy 58) over Cox Creek	Linn	3 — Serious	29,551	Good
Or 34 (hwy 210) over Calapooia Overflow	Linn	3 — Serious	29,513	Fair
Or 34 (hwy 210) over Calapooia Overflow	Linn	3 — Serious	29,513	Fair
Or 34 (hwy 210) over Calapooia River	Linn	3 — Serious	29,513	Fair
HWY 029 over Dairy Creek	Washington	3 — Serious	28,179	Fair
I-5 (hwy 1) NB over Oak Creek	Linn	3 — Serious	27,073	Good
I-5 (hwy 1) SB over Oak Creek	Linn	3 — Serious	27,073	Fair
I-5 (hwy 1) NB over Albany Ditch	Linn	3 — Serious	26,927	Fair
I-5 (hwy 1) SB over Albany Ditch	Linn	3 — Serious	26,927	Fair
US 30 (hwy 493) over Snake R. (hwy 493)	Malheur	3 — Serious	26,880	Good
I-84 (hwy 002) over Rock Creek	Wasco	3 — Serious	25,052	Fair
Or 18 (hwy 39) over Yamhill River Overflow	Yamhill	3 — Serious	24,417	Fair
Greenburg Road over Ash Creek	Washington	3 — Serious	24,002	Fair
HWY 002 (i-84) over Herman Creek	Hood River	3 — Serious	23,643	Fair
City Street 19t8 over 4th Street @ Bear Creek	Jackson	3 — Serious	23,554	Fair
I-5 (hwy 001) SB over S Umpqua R (vets Br)	Douglas	3 — Serious	23,447	Fair
I-5 (hwy 001) NB over S Umpqua R (vets Br)	Douglas	3 — Serious	23,447	Fair
Or 99w (hwy 91) SB over Marys River	Benton	3 — Serious	23,359	Fair
I-5 (hwy 001) NB over Mckenzie Oflow	Lane	3 — Serious	23,236	Fair
I-5 (hwy 001) SB over Mckenzie Oflow	Lane	3 — Serious	23,236	Fair
I-5 (hwy 001) NB over Mckenzie Oflow	Lane	3 — Serious	23,236	Fair
I-5 (hwy 001) SB over Mckenzie Oflow	Lane	3 — Serious	23,236	Fair
Or 34 (hwy 210) over Lake Creek	Linn	3 — Serious	23,134	Good
HWY 081 (or 99e) over Beaver Creek	Clackamas	3 — Serious	23,127	Fair
Or 18 (hwy 39) over Yamhill River	Yamhill	3 — Serious	22,538	Fair
Liberty ST SE over Pringle Creek	Marion	3 — Serious	21,752	Fair
I-5 (hwy 1) NB over Sodom Ditch Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Sodom Ditch Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) NB over Calapooia Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Calapooia Oflow	Linn	3 — Serious	21,606	Good
I-5 (hwy 1) NB over Calapooia Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Calapooia Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) NB over Sodom Ditch Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Sodom Ditch Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) NB over Courtney Creek Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Courtney Creek Oflow	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) NB over Courtney Creek	Linn	3 — Serious	21,606	Fair
I-5 (hwy 1) SB over Courtney Creek	Linn	3 — Serious	21,606	Fair
I-5 (hwy 001) NB over Tunnel Mill Race	Lane	3 — Serious	21,354	Fair
I-5 (hwy 001) NB over Bear CR	Jackson	3 — Serious	21,265	Fair
I-5 (hwy 001) SB over Bear CR	Jackson	3 — Serious	21,265	Fair
Or 62 (hwy 022) over Antelope Creek	Jackson	3 — Serious	21,174	Good
I-5 (hwy 001) NB over Camas Swale	Lane	3 — Serious	21,171	Fair
HWY 92 Conn over Columbia River	Columbia	3 — Serious	21,169	Fair
I-5 (hwy 001) NB over Bear CR	Jackson	3 — Serious	20,832	Fair
I-5 (hwy 001) SB over Bear CR	Jackson	3 — Serious	20,832	Good
I-5 (hwy 001) NB over Bear CR	Jackson	3 — Serious	20,818	Good
I-5 (hwy 001) SB over Bear CR	Jackson	3 — Serious	20,818	Good
I-5 (hwy 1) NB over Little Muddy Creek	Linn	3 — Serious	20,693	Fair
I-5 (hwy 1) SB over Little Muddy Creek	Linn	3 — Serious	20,693	Fair
I-5 (hwy 1) NB over Muddy Creek	Linn	3 — Serious	20,693	Fair
I-5 (hwy 1) SB over Muddy Creek	Linn	3 — Serious	20,693	Fair
HWY 140 (or 219) over Hess Creek	Yamhill	3 — Serious	20,200	Fair
Or 224 (hwy 171) over Rock Creek	Clackamas	3 — Serious	20,132	Good
I-5 (hwy 001) NB over Rogue River (homestead)	Jackson	3 — Serious	19,847	Fair
I-5 (hwy 001) SB over Rogue River (homestead)	Jackson	3 — Serious	19,847	Fair
Or 99w (hwy 91) over Creek	Benton	3 — Serious	19,591	Good
13th ST East over Shelton Ditch	Marion	3 — Serious	19,501	Fair
Or 99e (hwy 58) over Oak Creek	Linn	3 — Serious	19,406	Good
Us199 (hwy 025)nb over Rogue River	Josephine	3 — Serious	19,047	Fair
I-5 (hwy 001) NB over Creek	Lane	3 — Serious	19,034	Fair
I-5 (hwy 001) SB over Creek	Lane	3 — Serious	19,034	Good
US 199 (hwy 025)sb over Rogue River	Josephine	3 — Serious	18,505	Fair
SW 65th AVE over Nyberg Creek	Washington	3 — Serious	18,383	Good
Thomas Road over Rock Creek	Clackamas	3 — Serious	17,900	Fair
HWY 72 WB Off Ramp over 13th & Shelton Ditch	Marion	3 — Serious	17,817	Good
Redland Road over Clear Creek	Clackamas	3 — Serious	17,600	Fair
Or 18 (hwy 39) over South Yamhill River	Polk	3 — Serious	17,452	Good
Us101 (hwy 9) over Shangri La Creek	Clatsop	3 — Serious	16,793	Fair
US 20 (hwy 31) EB over Willamette River	Benton	3 — Serious	16,759	Fair
SE 45th AVE over B-90 Over Johnson Creek	Multnomah	3 — Serious	16,718	Fair
US 26 (hwy 026) over Alder Creek	Clackamas	3 — Serious	16,683	Fair
Brightwood Br RD over Sandy River	Clackamas	3 — Serious	16,500	Fair
I-84 (hwy 002) EB over Hood River	Hood River	3 — Serious	16,493	Fair
I-84 (hwy 002) WB over Hood River	Hood River	3 — Serious	16,493	Fair
Or 18 (hwy 39) over Deer Creek	Yamhill	3 — Serious	16,492	Fair
Or 18 (hwy 39) over South Yamhill River	Polk	3 — Serious	16,482	Fair
Or 18 (hwy 39) over Muddy Creek	Yamhill	3 — Serious	16,258	Fair
Belts RD over Creek Frontage RT	Linn	3 — Serious	16,064	Good
Belts RD over Creek Frontage RT	Linn	3 — Serious	16,064	Good
Foster RD over B-80a Over Johnson Creek	Multnomah	3 — Serious	16,018	Fair
Or 62 (hwy 022) over Little Butte Creek	Jackson	3 — Serious	15,897	Fair
Or 99w (hwy 91) over Jackson Creek	Benton	3 — Serious	15,894	Good
Amisigger RD over Deep Creek	Clackamas	3 — Serious	15,600	Fair
Or 99e (hwy 81) over Pudding River	Clackamas	3 — Serious	15,402	Fair
NE Airport Way over B-136 X Columbia Slough	Multnomah	3 — Serious	15,271	Fair
Or 18 (hwy 39) over South Yamhill River	Yamhill	3 — Serious	15,252	Fair
HWY 31 over Bowers Slough	Benton	3 — Serious	15,140	Fair
Or 99w (hwy 91) over Middle Creek Ash Creek	Polk	3 — Serious	14,546	Fair
Us101 (hwy 9) over Necanicum River	Clatsop	3 — Serious	14,464	Fair
Arndt Road over Pudding River Overflow	Clackamas	3 — Serious	14,416	Fair
Arndt Road over Pudding River	Clackamas	3 — Serious	14,416	Fair
Or 99 (hwy 234) over Deer Creek	Douglas	3 — Serious	14,285	Fair
Us101 (hwy 9) over Schooner Creek	Lincoln	3 — Serious	14,212	Fair
Or 99w (hwy 91) over North Fork Ash Creek	Polk	3 — Serious	14,149	Poor
I-5 (hwy 001) Con over HWY 1 SB Conn 7 Off Ramp	Multnomah	3 — Serious	14,116	Fair
Stanley AVE over Johnson Creek	Clackamas	3 — Serious	14,100	Fair
US 20 (hwy 33) over Beaver Creek	Lincoln	3 — Serious	14,067	Fair
US 20 (hwy 33) over Little Beaver Creek	Lincoln	3 — Serious	13,994	Fair
13th ST West over Shelton Ditch	Marion	3 — Serious	13,876	Fair
Us101 (hwy 9) over Drift Creek	Lincoln	3 — Serious	13,759	Fair
US 20 (hwy 31) WB over Willamette River	Benton	3 — Serious	13,386	Fair
Us101 (hwy 9) over Kilchis R. & Possetti RD	Tillamook	3 — Serious	13,357	Poor
Or 201 (hwy 455) over Malheur River	Malheur	3 — Serious	13,346	Fair
Patterson RD over Mill Race Canal	Lane	3 — Serious	13,287	Good
Or 99 (hwy 063) over Wagner Creek	Jackson	3 — Serious	12,804	Fair
Main ST over Coast Fk Willamette Riv	Lane	3 — Serious	12,757	Fair
HWY 210 EB over Willamette River	Benton	3 — Serious	12,687	Poor
Or 34 (hwy 210) WB over Willamette River	Benton	3 — Serious	12,687	Poor
Main ST over Silver Creek	Marion	3 — Serious	12,536	Fair
Or 58 (hwy 018) over Willamette R Relief Opng	Lane	3 — Serious	12,291	Fair
Or 58 (hwy 018) over Coast Fk Willamette R	Lane	3 — Serious	12,291	Fair
US 20 (hwy 33) over Marys River	Benton	3 — Serious	12,164	Fair
SW Bonita Road over Fanno Creek	Washington	3 — Serious	12,041	Fair
Or 126 (hwy 227)eb over Mckenzie Oflow	Lane	3 — Serious	12,026	Good
Or 126 (hwy 227)wb over Mckenzie Oflow	Lane	3 — Serious	12,026	Good
US 26 (hwy 026) over Salmon River	Clackamas	3 — Serious	12,006	Fair
I-84 (hwy 006) over Burnt River(dixie Cr)	Baker	3 — Serious	11,968	Fair
I-84 (hwy 006) over Burnt River (rr Tunnel)	Baker	3 — Serious	11,958	Good
US 26 (hwy 047) EB over East Fork Dairy Creek	Washington	3 — Serious	11,858	Fair
US 26 (hwy 047) EB over Bledsoe Creek	Washington	3 — Serious	11,858	Fair
Or 99w (hwy 91) NB over Marys River	Benton	3 — Serious	11,781	Fair
Wilsonville Road over Boeckman Creek	Clackamas	3 — Serious	11,613	Fair
HWY 81sb - HWY 171 over Johnson Ck	Clackamas	3 — Serious	11,588	Fair
190th AVE over Johnson Creek	Multnomah	3 — Serious	11,561	Fair
Or 224 (hwy 171) over Eagle Creek	Clackamas	3 — Serious	11,487	Fair
Whiskey Hill RD over Rock Creek	Clackamas	3 — Serious	11,450	Fair
HWY 081 NB over Molalla River	Clackamas	3 — Serious	11,423	Fair
HWY 81 SB over Mollala River	Clackamas	3 — Serious	11,423	Fair
Or 22 (hwy 030) over Mill Creek	Polk	3 — Serious	11,358	Fair
Salem AVE over Cox Creek	Linn	3 — Serious	11,330	Poor
Portland Avenue over Deschutes River	Deschutes	3 — Serious	11,211	Fair
Or 11 (hwy 008) over Little Walla Walla River	Umatilla	3 — Serious	10,992	Fair
Or 22 (hwy 162) EB over Beaver Creek	Marion	3 — Serious	10,913	Fair
Or 99e (hwy 58) over Willamette River	Linn	3 — Serious	10,393	Fair
Jackson School RD over Waible Creek	Washington	3 — Serious	10,382	Fair
Or 99w (hwy 91) SB over North Yamhill River	Yamhill	3 — Serious	10,350	Fair
Coburg Road over Overflow Channel	Lane	3 — Serious	10,265	Fair
Or 99w (hwy 91) NB over North Yamhill River	Yamhill	3 — Serious	10,193	Fair
US 199 (hwy 025) over Holton Creek	Josephine	3 — Serious	10,152	Fair
Towle AVE over Johnson Creek	Multnomah	3 — Serious	10,101	Good
Or 18 (hwy 39) over South Yamhill River	Yamhill	3 — Serious	10,099	Fair
Or 99 (hwy 063) over Ashland Creek	Jackson	3 — Serious	9,979	Fair
Or 99e (hwy 58) over Slough	Lane	3 — Serious	9,803	Fair
Holly LN over Abernethy Creek	Clackamas	3 — Serious	9,700	Poor
Or 51 (hwy 43) over South Fork Ash Creek	Polk	3 — Serious	9,615	Fair
Or 99w (hwy 91) over Luckiamute River	Polk	3 — Serious	9,582	Fair
US 26 (hwy 047) over West Fork Dairy Creek	Washington	3 — Serious	9,574	Poor
I-84 (hwy 006) EB over Malheur River	Malheur	3 — Serious	9,549	Fair
I-84 (hwy 006) WB over Malheur River	Malheur	3 — Serious	9,549	Good
Burgess RD over Little Deschutes River	Deschutes	3 — Serious	9,426	Fair
Redland RD (w) over Abernethy Creek	Clackamas	3 — Serious	9,270	Fair
Redland RD (e) over Abernethy Creek	Clackamas	3 — Serious	9,270	Fair
I-84 (hwy 006) WB over Umatilla R/uprr/usrs Can	Umatilla	3 — Serious	9,213	Fair
City Street 19t6 over 10th St. @ Bear Cr.	Jackson	3 — Serious	9,097	Fair