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Humboldt County · California

Highway History Research

Research category

Maintained by The Urban Road Association

Research category · Updated 8 September 2026
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Browse highway history across the library’s articles and source records. Categories describe research subjects, not legal or geographic boundaries.

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Articles and records#

  • Avenue of the Giants: History and Route Guide#

    A directional guide to the Avenue of the Giants, its communities, Humboldt Redwoods history, official park maps, and current SR 254, river, and weather reports.

    Topic hub
  • Humboldt County Logging History#

    An archival guide to Humboldt redwood logging, felling, steam equipment, rail transport, mills, and the relationship between timber history and conservation.

    Topic hub
  • Redwood Highway and Highway 101 History#

    A source-based guide to the Redwood Highway, former US 101 alignments, road engineering, bridges, and the Avenue of the Giants in Humboldt County.

    Topic hub
  • Avenue of the Giants History & Records#

    A historical-reference guide to the Avenue of the Giants, State Route 254, Humboldt Redwoods, nearby communities, maps, and Jay Smith Road records.

    Reference article
  • Avenue of the Giants Visitor Guide#

    Plan a source-informed visit to Avenue of the Giants with official park, SR 254, weather, and river-information links alongside historical context.

    Reference article
  • Bridge Creek bridge on the Avenue, 2000#

    Bridge Creek bridge on the Avenue, 2000. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2000
  • Caltrans Historical Transportation Chronology#

    Caltrans route-history appendices used to distinguish modern highway numbering from the earlier incorporation of road segments into the state system.

    Archival record · California Department of Transportation
  • Cedar Creek bridge on old Highway 101#

    Cedar Creek bridge on old Highway 101. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2000
  • Dyerville rail bridge and river#

    Dyerville rail bridge and river. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2024
  • Dyerville rail bridge in 2023#

    Dyerville rail bridge in 2023. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2023
  • Highway 36: How to Read the Chronology#

    Separating SR 36 route adoption, numbering, and construction dates from the Redwood Highway’s history.

    Reference article
  • Highway bridge in Richardson Grove, 2000#

    Highway bridge in Richardson Grove, 2000. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2000
  • Highway crossing of the South Fork Eel#

    Highway crossing of the South Fork Eel. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2017-08-16
  • Humboldt Highway History#

    A source-based transportation-history center distinguishing road construction, route numbering, highway naming, and remaining Highway 36 chronology research.

    Reference article
  • Hwy CA1 US101 1 South Fork Eel River#

    Hwy CA1 US101 1 South Fork Eel River. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2017-08-16
  • Hwy CA1 US101 4 South Fork Eel River#

    Hwy CA1 US101 4 South Fork Eel River. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2017-08-16
  • Logging truck on a California highway#

    Logging truck on a California highway. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2013
  • Looking through Moody Bridge#

    Looking through Moody Bridge. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · Documentation compiled after 1968
  • Moody Bridge across the South Fork Eel#

    Moody Bridge across the South Fork Eel. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · Documentation compiled after 1968
  • Moody Bridge central truss connection#

    Moody Bridge central truss connection. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · Documentation compiled after 1968
  • Moody Bridge end-post connection#

    Moody Bridge end-post connection. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · Documentation compiled after 1968
  • Moody Bridge in its river landscape#

    Moody Bridge in its river landscape. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · Documentation compiled after 1968
  • Rise and Shine — Avenue of the Giants#

    Licensed 4K and other wallpaper crops of redwood forest in the avenue of the giants region, with attribution and original-source information.

    Wallpaper
  • Rise and Shine — Avenue of the Giants#

    Redwood forest in the Avenue of the Giants region — photograph by Kirt Edblom, with source, license, and related historical research.

    Photograph · 2014-09-21
  • Side view of the old highway river bridge#

    Side view of the old highway river bridge. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2000
  • South Fork Eel bridge on old Highway 101#

    South Fork Eel bridge on old Highway 101. Source, photographer, date, license, archival context, responsive previews, and native-resolution wallpaper downloads.

    Photograph · 2000

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