301 ► California, Mariposa County, Mariposa — California State Mining and Mineral Museum —

Near Fairgrounds Road near California Highway 49, on the right when traveling east.

302 ► California, Mariposa County, Mariposa — La Mineta 1850 - Princeton 1854 - Mount Bullion 1862 —

On Princeton Road at Highway 49 Frontage Road on Princeton Road.

303 ► California, Mariposa County, Mariposa — Mount Ophir Mines

On Mount Ophir Road. Reported permanently removed.

304 ► California, Mariposa County, Yosemite National Park — Yosemite National Park — UNESCO World Heritage Site —

On Village Drive north of Northside Drive.

305 ► California, Mendocino County, Ukiah — 980 — Ukiah Vichy Springs Resort —

On Vichy Springs Road, on the right when traveling east.

306 ► California, Mono County, Benton — Montgomery City California —

On Highway 6, on the right when traveling north.

307 ► California, Mono County, Coleville — Golden Gate Mine —

On Golden Gate Road near Three Flags Highway (California Highway 395).

308 ► California, Mono County, Crestview — Bald Mountain Lookout — National Historic Lookout Register — Built 1963 —

Near Bald Mountain Road 12 miles east of U.S. 395.

309 ► California, Mono County, Crowley Lake — Hilton Creek Mines —

On Crowley Lake Drive at Hilton Creek Trail, on the left when traveling north on Crowley Lake Drive.

310 ► California, Mono County, June Lake — June Lake Mining District —

On North Shore Drive near Mount Vista Drive (Leonard Drive), on the right when traveling east.

311 ► California, Mono County, Lee Vining — Bennettville —

Near Saddlebags Lake Road at Tioga Pass Road (California Highway 120), on the right when traveling east.

312 ► California, Mono County, Lee Vining — Mandated Mono Lake Level —

Near California Route 120, 4.7 miles east of U.S. 395.

313 ► California, Mono County, Lee Vining — Mono Mills —

On State Highway 120 10 miles east of State Highway 395.

314 ► California, Mono County, Lundy — Lundy —

On Lundy Lake Road 7 miles west of U.S. 395, on the right when traveling west.

315 ► California, Mono County, Mammoth Lakes — Crowley Lake — Water for Los Angeles, Enjoyment for Anglers —

On U.S. 395, on the right when traveling north.

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316 ► California, Mono County, Mammoth Lakes — Crowley Lake — Water for Los Angeles, Enjoyment for Anglers —

On U.S. 395, on the right when traveling south.

317 ► California, Mono County, Mammoth Lakes — Mammoth City —

On Old Mammoth Road.

318 ► California, Mono County, Mammoth Lakes — The Mammoth Consolidated Gold Mine —

On Lake Mary Loop Road.

319 ► California, Monterey County, Marina — Welcome to Fort Ord Dunes State Park! —

On 8th Street.

320 ► California, Monterey County, Monterey — Chestnut Tree —

Near Pacific Street, on the right when traveling south.

321 ► California, Monterey County, Monterey — First Brick House —

Near Decatur Street north of Scott Street, on the right when traveling south.

322 ► California, Napa County, Calistoga — Old Faithful Steam Well —

On Tubbs Lane 0.8 miles south of Hwy 29, on the right when traveling south.

323 ► California, Napa County, Pope Valley — 2010-02 — Historic Aetna Mining District —

On Aetna Springs Road at Aetna Mine Road, on the right when traveling west on Aetna Springs Road.

324 ► California, Nevada County, Grass Valley — 298 — Empire Mine —

Near Empire Street near Route 174.

325 ► California, Nevada County, Nevada City — English and New Salmon Mine Stamp Mill —

Near Spring Street.

326 ► California, Nevada County, Nevada City — Giant —

On North Bloomfield Road at Relief Hill Road, on the right when traveling east on North Bloomfield Road.

327 ► California, Nevada County, Nevada City — Miners Foundry – Allans Machine Shop — Founded 1856 —

Near Spring Street.

328 ► California, Nevada County, North Columbia — Humbug Creek —

On North Bloomfield Road.

329 ► California, Nevada County, Truckee — Boca Townsite —

Near Stampede Meadows Road 0.3 miles Interstate 80.

330 ► California, Nevada County, Truckee — Rocking Stone —

On High Street near Keiser Avenue.

331 ► California, Nevada County, Washington — 628 - 629 — Alpha and Omega —

On State Highway 20, on the left when traveling east.

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332 ► California, Orange County, Brea — 918 — Olinda —

On Carbon Canyon Road at Santa Fe Road, on the right when traveling east on Carbon Canyon Road.

333 ► California, Orange County, Brea — 50 — Olinda Oil Museum and Trail — Olinda Oil Well #1 —

On Santa Fe Road east of Railway Avenue.

334 ► California, Orange County, Irvine, Northwood — The Evolution of the City — Irvine —

Near Jeffrey Road north of Roosevelt, on the right when traveling north.

335 ► California, Orange County, La Habra — West Coyote Field — The La Habra Research Laboratory —

On West Imperial Highway (California Route 90) near Beach Boulevard, on the right when traveling east.

336 ► California, Orange County, Yorba Linda — Section of the Cajon Canal —

Near Susanna Bryant Drive at Rancho Santa Ana Road, on the left when traveling south.

337 ► California, Orange County, Yorba Linda — The Historic Cajon Canal — 1878 - 1968 —

Near La Palma Avenue near Gypsum Canyon Road.

338 ► California, Placer County, Auburn — Gold Bug Stamp Mill —

Near Auburn-Folsom Road 0.1 miles south of Lincoln Way.

339 ► California, Placer County, Auburn — Marguerite Mine “Quartz Rock” —

Near Lincoln Way.

340 ► California, Placer County, Auburn — Wise Power Plant —

On Ophir Road near Werner Road, on the right when traveling south.

341 ► California, Placer County, Cisco Grove — 2 — Meadow Lake —

On Eagle Lakes Road near Interstate 80, on the right when traveling west.

342 ► California, Placer County, Gold Hill — Hydraulic Mining —

On Interstate 80.

343 ► California, Placer County, Newcastle — 400 — Virginiatown —

On Virginiatown Road 0.2 miles east of Fowler Road, on the left when traveling east.

344 ► California, Placer County, Ophir — 463 — Town of Ophir —

On Lozanos Road at Bald Hill Road, on the right when traveling north on Lozanos Road.

345 ► California, Placer County, Tahoe City — A Safe Harbor —

Near West Lake Boulevard (State Highway 89) west of State Highway 26.

346 ► California, Plumas County, Belden — Pacific Crest Trail —

On Belden Town Road, on the right when traveling west.

347 ► California, Plumas County, Blairsden — 196 — Jamison City, Eureka Mine and Mill, Johnstown — ← 6 Miles —

On California Route 70 at Route 89, on the right when traveling west on California Route 70.

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348 ► California, Plumas County, Chester — Humbug Valley —

On Forest Service Road 26N26, on the right when traveling south.

349 ► California, Plumas County, Chester — Soda Spring —

On Forest Service Road 26N26, on the right when traveling south.

350 ► California, Plumas County, Cromberg — Vardanega Spring —

On Mt. Tomba Road, on the right when traveling south.

351 ► California, Plumas County, Greenville — Engelmine —

On Diamond Mountain Road 9.1 miles north of North Valley Road, on the right when traveling north.

352 ► California, Plumas County, Greenville — Seneca —

On Seneca Road (at milepost 6).

353 ► California, Plumas County, La Porte — Port Wine —

On Port Wine Ridge Road (County Route 690).

354 ► California, Plumas County, Quincy — Spanish Creek Mines —

Near Bucks Lake Road (County Route 119) at Snake Lake Road, on the left when traveling east.

355 ► California, Riverside County, Desert Center — Barren or Bountiful — Joshua Tree National Park —

On Cottonwood Springs Road.

356 ► California, Riverside County, Desert Center — 41 — Eagle Mountain Iron

Near Ragsdale Road west of Desert Center Rice Road (County Route 177), on the right when traveling east. Reported missing.

357 ► California, Riverside County, Lake Elsinore — 90 — Mary McDonald Gazebo — Fountain & Building —

On Heald Avenue at Riley Street, on the left when traveling west on Heald Avenue.

358 ► California, Riverside County, Lake Elsinore — Plants and People — Luiseño Indian Uses —

On Sumner Avenue near Riley Street, on the left when traveling west.

359 ► California, Sacramento County, Folsom — 240 — Mormon Island —

Near Folsom Point Road 0.5 miles north of Natoma Street.

360 ► California, Sacramento County, Rancho Cordova, Mather — Vernal Pool Grassland — Mather Vernal Pools —

On Eagles Nest Road 2 miles south of Douglas Road.

361 ► California, Sacramento County, Rancho Murieta — 468 — Gold Mining and Michigan Bar —

On Michigan Bar Road at Highway 16, on the left when traveling north on Michigan Bar Road.

362 ► California, San Benito County, Aromas — A. R. Wilson Quarry —

On Quarry Road 0.7 miles west of Carpenteria Road, on the right when traveling east.

363 ► California, San Bernardino County, Baker — Salt Creek — A Desert and Riperian and Wetland Area —

On Death Valley Road 1 mile south of Saratoga Springs Road.

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364 ► California, San Bernardino County, Baker — Salt Creek Hills — Area of Critical Environmental Concern —

Near California Route 127 29 miles north of Baker, on the right when traveling north.

365 ► California, San Bernardino County, Big Bear, Holcomb Valley — People Came and Left This Meadow —

On Holcomb Valley Road (Forest Road 3N16) 0.5 miles east of 3N09.

366 ► California, San Bernardino County, Big Bear City — 5 Stamp Mill — Big Bear Valley Historical Museum —

Near Greenway Drive 0.3 miles north of Big Bear Boulevard, on the right when traveling north.

367 ► California, San Bernardino County, Big Bear City — 619 — Holcomb Valley —

Near Greenway Drive 0.3 miles north of Big Bear Boulevard, on the right when traveling north.

368 ► California, San Bernardino County, Big Bear Lake — 2 — Holcomb Valley

Near Holcomb Valley Road (Road 3N16) 0.5 miles east of Van Dusen Canyon Road (Road 3N09), on the right when traveling west. Reported missing.

369 ► California, San Bernardino County, Hesperia — 6 — Hesperia’s Original Water Source — 1886 —

On Arrowhead Lake Road north of Welsh Road, on the right when traveling north.

370 ► California, San Bernardino County, Hesperia — 14 — Mojave Indian Trail — Hesperia Lakes —

Near Arrowhead Lake Road 0.7 miles south of Ranchero Road, on the left when traveling south.

371 ► California, San Bernardino County, Hesperia — 12 — Original Water Supply Ditch — 1880’s —

On Hesperia Road 0.1 miles south of Muscatel Street, on the right when traveling south.

372 ► California, San Bernardino County, Ivanpah — Ivanpah Solar Electric Generating System — Looking to The Sun —

Near Primm Boulevard south of Interstate 15.

373 ► California, San Bernardino County, Joshua Tree National Park — Barker Dam —

Near Barker Dam Road 1.5 miles east of Park Road, on the left when traveling east.

374 ► California, San Bernardino County, Joshua Tree National Park — Wall Street Mill —

On Barker Dam Road 1.5 miles east of Park Road, on the left when traveling east.

375 ► California, San Bernardino County, Mountain Pass — 70 — Valley Wells —

On Interstate 15 26 miles south of Primm, on the right when traveling south.

376 ► California, San Bernardino County, Nipton — 30 — Mining Town of Hart —

On Hart Mine Road 0.4 miles east of Walking Box Ranch Road.

377 ► California, San Bernardino County, Nipton, Mojave National Preserve — Teutonia Peak Trail — 3 miles round-trip —

On Cima Road 11.5 miles south of Interstate 15, on the right when traveling south.

378 ► California, San Bernardino County, Oro Grande — Oro Grande Cemetery

On Olive Street 0.2 miles east of 1st Street. Reported missing.

379 ► California, San Bernardino County, Rancho Cucamonga — 1887 —

On Foothill Boulevard (California Route 66) east of Baker Avenue, on the right when traveling west.

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380 ► California, San Bernardino County, Redlands — 43 — Mill Creek Zanja — State Historic Landmark No. 43 —

Near North University Street, on the right when traveling south.

381 ► California, San Bernardino County, Trona — 134 — Epsom Salts Monorail —

On Trona Road (California Route 178) at Pinnacle Road, on the right when traveling east on Trona Road.

382 ► California, San Bernardino County, Trona — 101 — John & Dennis Searles Wagon Routes — 1875 - 1895 —

On Trona Road (California Route 178) at Pinnacle Road, on the right when traveling east on Trona Road.

383 ► California, San Bernardino County, Trona — Welcome to the Trona Pinnacles — ... a National Natural Landmark —

Near California Route 178.

384 ► California, San Bernardino County, Twentynine Palms — Cottontails and Jackrabbits —

Near Indian Cove Nature Trail west of Indian Cove Road West, on the right when traveling north.

385 ► California, San Bernardino County, Twentynine Palms — Desert Willow —

On Indian Cove Nature Trail west of Indian Cove Road West, on the right when traveling north.

386 ► California, San Bernardino County, Twentynine Palms, Joshua Tree National Park — Desert Queen Mine —

Near Desert Queen Mine Road at Queen Valley Road.

387 ► California, San Bernardino County, Twentynine Palms, Joshua Tree National Park — Ryan Ranch —

On Park Boulevard 16 miles south of 29 Palms Highway, on the right when traveling south.

388 ► California, San Bernardino County, Victorville — Mormon Springs —

On 8th Street at C Street, on the right when traveling south on 8th Street.

389 ► California, San Bernardino County, Yucca Valley — 109 — Warren's Well —

On Crestview Drive east of Airway Avenue.

390 ► California, San Diego County, Borrego Springs — Anza-Borrego Desert State Park — Visitor Center —

On Palm Canyon Drive 1.8 miles west of Borrego Springs Road, on the right when traveling west.

391 ► California, San Diego County, San Diego — Old Mission Dam — Built 1813 - 1816 — San Diego —

Near Father Junipero Serra Trail.

392 ► California, San Diego County, San Diego — Providing Year-Round Water — Old Mission Dam —

On Father Junipero Serra Trail.

393 ► California, San Francisco City and County, San Francisco, Golden Gate Park — Murphy Windmill — Natural Features —

Near Martin Luther King Jr. Drive north of Lincoln Way, on the right when traveling west.

394 ► California, San Francisco City and County, San Francisco, Golden Gate Park — Planning Golden Gate Park

Near Martin Luther King Jr. Drive near Lincoln Way, on the right when traveling east. Reported missing.

395 ► California, San Francisco City and County, San Francisco, Lincoln Park — Peoples of the Coast — Why did they live here? —

On Lands End Trail north of Point Lobos Avenue.

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396 ► California, San Francisco City and County, San Francisco, Merced Heights — Granville House —

On Randolph Street near Head Street, on the right when traveling east.

397 ► California, San Francisco City and County, San Francisco, Presidio Terrace — San Francisco's First People —

On Lake Street.

398 ► California, San Luis Obispo County, Carrizo Plain National Monument — Soda Lake —

Near Soda Lake Road 2.2 miles south of Seven Mile Road, on the left when traveling south.

399 ► California, San Luis Obispo County, Carrizo Plain National Monument — Soda Lake —

Near Soda Lake Road 1 mile south of Simmler Road, on the right when traveling south.

400 ► California, San Luis Obispo County, Carrizo Plain National Monument — Soda Lake —

Near Soda Lake Road 2.1 miles south of Seven Mile Road, on the right when traveling south.

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