| Jacobs Ladder | | |
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| Jakes Island Trail | | |
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| Jakey Lake Trail | Lassen Volcanic National Park | |
| The trail to Jakey Lake is six miles round trip with a steep ascent of 400 feet on the return. You'll find few fellow hikers on the trail. |
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| James Irvine Trail | Redwood National Park | 4.2 |
| James Irvine Trail and Miner's Ridge Trail complete a full 10.3 mile loop trail with camping available at Gold Bluff Beach campground. It is suggested you take Miner's Ridge down from the visitor center and return via James Irvine Trail which follows a... |
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| Jayhawker Canyon | Death Valley National Park | |
| This trail leads through the Jayhawker Canyon drainage. It begins on Highway 190 and ends at the base of Pinto Peak. It is not recommended for summer use due to extreme heat. |
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| Jedediah Smith Trail | | |
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| Jenkins Hill Trail | | |
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| Jenks Lake Trail | San Bernardino National Forest | 1 |
| Jenks Lake is a great place to hike, picnic, sightsee, and fish. |
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| Jennie Lakes Trail | Sequoia and Kings Canyon National Park | 12 |
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| Jensen Loop Trail | Redwood National Park | 0.6 |
| This is an excellent trail to walk from the campground during the summer. |
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| Jepson Trail | | |
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| Jerkey Meadow Trail | Sequoia National Forest | 9.8 |
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| Jesusita Trail | | |
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| Jewell Trail | | |
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| Jim Jam Trail | Shasta-Trinity National Forests | 7.7 |
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| Jogging Trail | Redwood National Park | 4 |
| This route crosses Wolf Creek Bridge and is clearly signed along the way. |
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| John Muir Trail | | |
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| Johnny Lang Canyon Corridor | Joshua Tree National Park | 3.5 |
| This trail begins at the Quail Springs historic route southeast of Samuelson rock and the cabin site, and the corridor ends at the end of the canyon where the Ryan Mountain connector trail begins. The canyon provides quiet beauty and variety of terrain... |
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| Johnson Trail | | |
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| Johnston Ridge Trail | Los Padres National Forest | 9 |
| The Johnston Ridge Trail offers Wilderness access along a nine mile, difficult trail. Prior to the June 1992 wilderness legislation, this was a popular motorcycle trail. It is now open only to horseback riders and hikers. |
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| Johnstone Trail | | |
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| Joplin Trail | | |
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| Joplin Truck Trail | | |
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| Jordon Hot Springs Trail | Sequoia National Forest | |
| An arduous all day 12-mile round trip from Blackrock Mountain trailhead through Casa Vieja Meadow, traveling down Ninemile Creek to Jordon Hot Springs. |
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| Juan Bautista de Anza National Historical Trail | California BLM Areas | |
| The Fort Ord segment of Juan Bautista de Anza National Historic Trail explores eleven miles of maritime chaparral, oak woodland, and open grassland habitat. |
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