Navajo County Bridge Report Card

Navajo County scores 86 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B86 / 100

Local infrastructure snapshot

Navajo County, Arizona

Navajo County has 278 bridges in the National Bridge Inventory, with 6 rated poor and 8 rated scour-critical. Its poor-condition share of 2.2% is above the 1.1% statewide average. Poor-condition bridges carry about 27,920 daily vehicle crossings.

278Total Bridges

6Poor (2.2%)

124Fair (44.6%)

8Scour-Critical

Quote-Ready Local Facts

2.2%of county bridges are in poor condition, compared with 1.1% statewide and 6.7% nationally.

27,920daily vehicle crossings are on poor-condition bridges in the county.

8bridges are rated scour-critical, or 2.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Navajo County a Bridge Condition Exposure Score of 86/100 (B). The county has 278 bridges in the National Bridge Inventory, including 6 in poor condition and 8 rated scour-critical. Poor-condition bridges carry about 27,920 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	2.2%	4.3
Poor-condition traffic exposure	25	1.9% of measured traffic	1.4
Scour-critical bridge share	20	2.9%	5.8
Average age vs national baseline	10	53 years vs 48 nationally	2.1
Traffic-data completeness	5	1,481,803 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	2.2%
State Poor-Condition Share	1.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.9%
Average Bridge Age	53 years
Poor-Condition Traffic Exposure	27,920 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-40 WB over SB 40 — 21,131 vehicles/day Oldest Listed BridgeShumway RD over Silver Creek — built in 1900 All County BridgesBrowse every bridge record in Navajo County.

Top Bridges to Watch in Navajo County

Bridge	Reason	Condition	Daily Traffic	Year Built
IRR BIA RTE N15 over Black Canyon Wash	Poor condition + traffic exposure	Poor	2,051	1986
IRR BIA RTE N6486 over Laguna Creek	Poor condition + traffic exposure	Poor	150	1965
I-40; Sfr over Ltl Lithodendron Wash	Poor condition + traffic exposure	Poor	60	1932
I-40 WB over SB 40	Poor condition + traffic exposure	Poor	21,131	1969
IRR BIA RTE N4 over Wepo Wash	Poor condition + traffic exposure	Poor	4,078	1990
IRR BIA RTE N65 over Tse Chizzi Wash	Poor condition + traffic exposure	Poor	450	1976
US 160 over Church Rock Wash	Scour-critical foundation rating	Fair	4,533	1961
IRR SR 87 over Coyote Wash	Scour-critical foundation rating	Fair	2,376	1965
US 180 over Little Colorado River	Scour-critical foundation rating	Fair	876	1961
Shumway RD over Silver Creek	Scour-critical foundation rating	Fair	400	1900

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.