There is a description of the North loop in Wert’s Bakeries #84. Here is a description of the loop (clockwise), credited to the Seattle Bicycle Club:
Starting Point: Gas Works Park. The North Lake Washington Loop is 42.3 miles. By adding to it, the Mercer Island Loop, you extend your overall ride by 9.0 miles.
0.0
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R
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Burke-Gilman Trail
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7.2
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Mathews Beach (Restrooms)
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13.3
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R
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68th Ave NE (Very Hilly Route)
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For less hills and a 1.0 mile savings, continue and turn right on 96th Ave NE (Waynita Way) @ Wayne Golf Course Club House, mile post 14.0. Road continues as 100th Ave NE which becomes 98th Ave NE. (See also the Juanita Hill Bypass as an alternative)
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14.9
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Continues as Juanita Drive
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19.2
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R
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98th Ave NE
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Continues as Market Street
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L
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Central Way
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21.3
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R
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Lake Street
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Marina Park on Right, Kirkland Bakery on Left.
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Continues as Lake Washington Blvd. (Lakeview Drive)
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24.0
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BL
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NE Northrup Way
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R
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108th Ave SE to 110th Ave SE to 112th Ave SE
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(Route follows along west side of I-405 going South)
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26.0
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L
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114th Ave SE (Turn just after crossing NE 8th Street)
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Continues as Lake Washington Blvd. SE
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Continues as 118th Ave SE
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29.0
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R
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Lake to Lake Trail – Under I-90 Bridge (Wooden Bridge)
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30.5
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Entrance to Mercer Island Bridge
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30.7
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FOLLOW I-90 BIKE TRAIL ACROSS MERCER ISLAND.
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33.0
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Baseball Park Restrooms and Water Stop.
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35.3
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R
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Exit trail after last bridge to Lk Wash Blvd (at S. Irving St.)
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36.4
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L
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Onto Lakeside Ave (LK Wash Blvd) at North Leschi Center
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37.7
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BL
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Follow Lake Wash Blvd up hill through Lakeview Park.
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38.5
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Cross E. Madison (FOLLOW SIGNS TO ARBORETUM.)
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39.6
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Exit Arboretum
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40.0
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R
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24th Ave E (across 520)
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40.2
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L
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E. Shelby Street
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40.3
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R
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Montlake Blvd. E (Across Draw Bridge)
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40.5
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L
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Across NE Pacific Street to UW
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40.7
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L
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Burke-Gilman Trail.
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42.3
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Finish at Gas Works Park
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