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Old Maps of Petrolia, California for Metal Detecting

Plan your next treasure hunt with 11 historic maps of Petrolia. Find old homesites, ghost towns, trails, and gathering spots that may be lost to time — perfect for identifying promising metal detecting locations.

  • Locate forgotten sites: Uncover places like long-lost settlements, abandoned rail lines, or gathering spots.
  • Plan better hunts: Use map overlays combined with LiDAR or satellite views to narrow in on historically rich areas.
  • Made for detectorists: Thousands of hobbyists use these maps to discover relics, coins, and hidden history.

Use these historic maps to boost your research and find new opportunities beneath the surface of Petrolia.

Petrolia, CA maps

(11)
  1. 1921 Map of Cape Mendocino
    1921 Map of Cape Mendocino
    1921 Cape Mendocino
    1921 Print · USGS
    Coastal Humboldt County was a region of scattered homesteads and river valleys in the early 1920s. Genealogists and researchers can trace family-named locations such as Hansens and Prestons, or locate the Race Track near Petrolia.
  4. 1949 Map of Eureka
    1949 Map of Eureka
    1949 Eureka
    1949 Print · USGS
    Coastal Northern California in the late 1940s shows a landscape of timber towns and maritime outposts. You can trace the Northwestern Pacific rail line through Eureka or locate family landmarks like the Tyson Chrome Mine and Crescent City Lighthouse.
    2 unique versions available
  7. 1950 Map of Cape Mendocino, 1955 Print
    1950 Map of Cape Mendocino, 1955 Print
    1950 Cape Mendocino
    1955 Print · USGS
    Coastal Humboldt County in the mid-fifties reveals a landscape of isolated ranches and maritime outposts at the continent's edge. Genealogists and historians can trace family holdings like Bonanza Ranch or locate the abandoned school near Petrolia.
  10. 1951 Map of Cape Mendocino
    1951 Map of Cape Mendocino
    1951 Cape Mendocino
    1951 Print · USGS
    Coastal Humboldt County in the early fifties shows a landscape of isolated ranches and maritime outposts along the Pacific. Researchers can trace the layout of Petrolia, locate the Coast Guard Reservation, and find family-named landmarks like Green Pond Ranch and Bonanza Ranch.
    2 unique versions available
  13. 1958 Map of Eureka, 1967 Print
    1958 Map of Eureka, 1967 Print
    1958 Eureka
    1967 Print · USGS
    Northern California's rugged redwood coast and timber corridors are captured in the late fifties, from the Oregon border down to Shelter Cove. Researchers can trace the path of the Northwestern Pacific railroad and locate rural landmarks like Grizzly Bluff School or the St Josephs Sch.
  16. 1958 Map of Eureka, 1978 Print
    1958 Map of Eureka, 1978 Print
    1958 Eureka
    1978 Print · USGS
    Coastal Humboldt County is captured here in the late fifties, showing the region's logging and maritime identity before later development changed the Eel River delta. Genealogists and historians can trace the Northwestern Pacific rail line and locate old community hubs like Rio Dell, Scotia, and Ferndale.
  19. 1961 Map of Eureka
    1961 Map of Eureka
    1961 Eureka
    1961 Print · USGS
    The Northern California coast and its deep redwood forests are mapped here at a time when the timber and rail industries defined the region. Researchers can trace historic family ranches and remote sites like Fort Dick, Table Bluff Lighthouse, and the Copper Creek Mine.
    2 unique versions available
  22. 1969 Map of Petrolia, 1974 Print
    1969 Map of Petrolia, 1974 Print
    1969 Petrolia
    1974 Print · USGS
    Humboldt County's remote coast is captured here in the late 1960s, centered on the historic oil-producing settlement of Petrolia. Researchers can trace old family landmarks and burial sites like Graves or locate State Historical Mon 543 First Oil Field in California near the Mattole River.
  25. 1989 Map of Cape Mendocino
    1989 Map of Cape Mendocino
    1989 Cape Mendocino
    1989 Print · USGS
    The Humboldt coast in the late eighties reveals a landscape where massive redwoods meet the deep sea. Genealogists and historians can trace the remote outposts of Petrolia and Capetown or locate historic markers like the Punta Gorda Lighthouse.
  28. 1997 Map of Petrolia, 2002 Print
    1997 Map of Petrolia, 2002 Print
    1997 Petrolia
    2002 Print · USGS
    The Mattole Valley in the late twentieth century remains a landscape of remote ranching and early industrial history. Trace the site of the State's first oil field or locate the coastal landmarks at Punta Gorda and Sea Lion Rock.
  31. 2021 Map of Petrolia, 2021 Print
    2021 Map of Petrolia, 2021 Print
    2021 Petrolia
    2021 Print · USGS
    The coastal Mattole River valley comes to life in this contemporary survey of California's remote Humboldt shore. Genealogists and hikers can trace the Lost Coast Trl past landmarks like Punta Gorda or locate family sites near Petrolia Cem and The H J.
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Showing maps 1-11 of 11

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