| 7 | Description | Difficulty | Reference | Map | Management Unit | |||
| 8 | Iceberg Lake | E | 5.00 | 2.25 | 100 Hikes in the North Cascades | Mt. Shuksan | Mt. Baker Wilderness | |
| 9 | Icicle Creek | E | 8.50 | 900 | 2.50 | 100 Hikes in the Alpine Lakes | Chiwaukum Mtns. | Alpine Lakes Wilderness |
| 10 | Icicle Ridge | H | 12.00 | 5200 | 2.50 | 100 Hikes in the Alpine Lakes | Leavenworth/ Chiwaukum Mtns. | Alpine Lakes Wilderness |
| 11 | Independence and North Lakes | M | 6.50 | 1.50 | Trips and Trails 1 | Silverton | Mt. Baker-Snoqualmie N.F., Darrington R.D. | |
| 12 | Independence Pass- Norway Pass One Way | E | 7.50 | 1000 | 2.50 | 100 Hikes in Northwest Oregon | Mt. St. Helens | Mount St. Helens National Volcanic Monument |
| 13 | Index Town Roof | M | 5.00 | 1700 | 1.25 | Footsore 2 | Index | Mt. Baker-Snoqualmie N.F., Skykomish R.D. |
| 14 | Description | Difficulty | Reference | Map | Management Unit | |||
| 15 | Indian Bar | H | 14.50 | 2.00 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier East | Mount Rainier National Park | |
| 16 | Indian Creek | E | 8.00 | 900 | 2.50 | 100 Hikes in Glacier Peak Region | Wenatchee Lake | Glacier Peak Wilderness |
| 17 | Indian Heaven Loop | M | 9.50 | 1700 | 5.00 | 100 Hikes in S. Cascades & Olympics | Lone Butte/ Wind River | Indian Heaven Wilderness |
| 18 | Indian Henry's from Longmire | H | 13.00 | 2.25 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West | Mount Rainier National Park | |
| 19 | Indian Henry's Hunting Ground | H | 7.00 | 2500 | 2.00 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West | Mount Rainier National Park |
| 20 | Indian Henry's Loop: Longmire- Kautz Cr. | H | 12.00 | 3300 | 2.25 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West/ Randle | Mount Rainier National Park |
| 21 | Description | Difficulty | Reference | Map | Management Unit | |||
| 22 | Indian Henry's via Kautz Creek | H | 11.00 | 2.25 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West and Randle | Mount Rainier National Park | |
| 23 | Indian Pass | H | 16.00 | 700 | 3.50 | Olympic Mountains Trail Guide | Spruce Mtn. | Olympic National Park |
| 24 | Indian Race Track and Red Mountain | M | 7.00 | 5.00 | 100 Hikes in S. Cascades & Olympics | Wind River | Indian Heaven Wilderness | |
| 25 | Ingalls Creek | M | 12.00 | 1200 | 2.50 | 100 Hikes in the Alpine Lakes | Liberty/ Mt. Stuart | Alpine Lakes Wilderness |
| 26 | Ingalls Lake | H | 9.00 | 2.25 | 100 Hikes in the Alpine Lakes | Mt. Stuart | Alpine Lakes Wilderness | |
| 27 | Ingalls Lake via Long's Pass | H | 15.00 | 4000 | 2.25 | 100 Hikes in the Alpine Lakes | Mt. Stuart | Alpine Lakes Wilderness |
| 28 | Description | Difficulty | Reference | Map | Management Unit | |||
| 30 | Ipsut Creek | H | 8.00 | 2800 | 1.75 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West | Mount Rainier National Park |
| 31 | Ipsut Creek to Mowich Lake One Way | H | 6.50 | 2800 | 1.50 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West | Mount Rainier National Park |
| 32 | Ipsut Pass/ Spray Park/ Seattle Park | H | 15.50 | 5600 | 1.75 | 50 Hikes in Mt. Rainier N.P. | Mt. Rainier West | Mount Rainier National Park |
| 33 | Iron Bear | M | 6.00 | 1900 | 2.00 | 100 Hikes in the Alpine Lakes | Liberty | Wenatchee N.F., Cle Elum R.D. |
| 34 | Iron Goat Trail | E | 7.00 | 300 | 1.50 | Exploring Washington's Wild Areas | Stevens Pass | Mt. Baker-Snoqualmie N.F., Skykomish R.D. |
| 35 | Description | Difficulty | Reference | Map | Management Unit | |||
| 36 | Iron Mountain | M | 11.00 | 2000 | 2.25 | Teanaway Country | Liberty | Wenatchee N.F., Leavenworth R.D. |
| 37 | Iron Peak | H | 7.50 | 2700 | 2.25 | 100 Hikes in the Alpine Lakes | Mt. Stuart | Wenatchee N.F., Cle Elum R.D. |
| 38 | Island and Rainbow Lakes | H | 12.00 | 2600 | 0.75 | 100 Hikes in the Alpine Lakes | Bandera/ Snoqualmie Pass | Alpine Lakes Wilderness |
| 39 | Issaquah to Preston One Way | E | 6.00 | 400 | 0.50 | Footsore 1 | USGS Issaquah/ Fall City |
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