Issaquah Mountain/Mercer Island loop

This loop is considered a difficult road ride, best suited for experienced cyclists with very good fitness. It features a significant elevation gain of around 954 meters over its 93 km distance, including steep climbs on the Issaquah Mountain (Squak Mountain) portion and rolling hills on Mercer Island. It's a popular training route due to its demanding nature.

On average, cyclists can expect to spend about 4 hours and 35 minutes on the saddle to complete the entire 93 km loop. This duration can vary based on your fitness level and how often you stop.

The route offers a diverse terrain. Mercer Island features well-maintained, paved roads with a series of rolling hills. The 'Issaquah Mountain' section, often referring to Squak Mountain, involves more substantial and steep climbs, with gradients up to 16% in some sections. While roads are generally good, some parts on Mercer Island may lack a dedicated shoulder, requiring caution.

The best time to cycle this loop is generally from late spring through early fall (May to October) when weather conditions are most favorable. During these months, you'll experience less rain and more comfortable temperatures. Winter cycling is possible but can be challenging due to colder temperatures, potential rain, and slicker roads, especially on descents.

Yes, the route offers several points of interest. You'll ride along sections of the Cedar River Trail and the Renton Airport Bike Route. You'll also pass through Mercer Island, offering glimpses of Lake Washington and the Seattle/Bellevue skylines, and cross the East Channel Bridge. The I-90 bridge crossing provides unique views over Lake Washington.

Parking options are available in both Issaquah and Mercer Island. Many cyclists choose to start near the I-90 bike trail access points, which connect to the loop. Specific parking lots can be found near public parks or trailheads in these areas, though availability may vary, especially on busy weekends.

No, this specific loop is not recommended for beginners or families with young children due to its difficult rating, significant elevation gain, and long distance. The challenging climbs and potential for traffic on some road sections require a good level of fitness and cycling experience. There are more family-friendly and beginner-suitable trails in the wider Issaquah and Mercer Island areas.

As this route primarily follows public roads and designated bike paths, dogs are generally allowed if they are on a leash and you adhere to local regulations. However, cycling with a dog on a leash for such a long and challenging route is not practical or safe. If you plan to bring a dog, consider shorter, dedicated multi-use trails in the area.

No, you do not need any special permits or pay entrance fees to cycle the Issaquah Mountain/Mercer Island loop. It utilizes public roads and trails that are freely accessible to cyclists.

Yes, the route integrates with several other trails. Notably, it includes significant portions of the Lake Washington Loop and the Cedar River Trail. You'll also encounter sections of the Mountains to Sound Trail and the I-90 Trail, which provides a crucial connection over Lake Washington.

Yes, both Issaquah and Mercer Island offer amenities. You'll find cafes, restaurants, and convenience stores in the urban and suburban areas of both locations, particularly on Mercer Island. There are also local bike shops in the vicinity for any repair needs. It's always wise to carry enough water and snacks for the more remote sections, especially on the Issaquah Mountain climb.