MUMPS: Clockwise Lake Loop with Variations (Brisk)


  • Advance online registration is required.
  • Attendance at the pre-ride safety briefing is required in order to ride with the group.
  • Ride capacity may be limited.  Exact size is set by the ride leader, and displayed below.
  • If you decide not to ride, please click Cancel My Registration below to open space for others. (How to cancel
  • All participants must follow Wash. state guidance on masking, distancing and vaccination for indoor and outdoor activities.
  • Some rides stop at indoor venues. All riders should have face coverings available in case a business or public transit requires their use. Venues might require proof of vaccination or recent negative test result.
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Date and Time: 
Monday, October 25, 2021 - 9:50am
Start Location: 
Tracy Owen Station/Log Boom Park, Kenmore
17415 61st Ave NE
Kenmore, WA 98028
Contact Information: 
David Gregg
52.70 miles
Elevation Gain: 
2,434 feet
Weather Cancellation: 
Fitness / Health
Ride Description: 

Please join the MUMPS for a Lake Washington clockwise loop variation that heads up into Shoreline then descends Perkins Way just before the finish.

Route: We’ll warm up by climbing 100th then down to Marina Park in Kirkland for a quick restroom break, then through Bellevue and after a section of the Eastrail we'll stop at Coulon Park. After riding down and around the southern tip of Lake Washington, we'll head up to Cafe Vita (Seward Park) for a quick coffee break. Finally, we'll ride through the Arboretum, the U District, then climb up through Shoreline before descending on Perkins Way. 

Note that in case of rain, we MAY switch to the rain-friendly alternate route, which uses more trail and less road (see "Rain Route" link below).

Start Time & Location: Log Boom Park is closed for renovation, so let's meet down the path which heads south from the SE corner of the Log Boom parking lot @ 175th. Go to the end of the path and look on the dock if you don't see us on the path itself. There are sanicans available (at the NE corner of the parking lot), but no running water, so plan accordingly.

Please be there, ready to ride, at the date and time noted above. We will start with the required safety briefing, and roll out when that's done.  If you miss the briefing you will not be able to ride with the group.

Parking: Please do not park in the Log Boom parking lot; use the on-street parking on NE 175thSt. just east of the park.

Pace: The MUMPS series offers multiple paces.  Riders are welcome change pace groups during the ride. We'll observe the speed limit on multi-use trails.

Navigation: The planned route/cue sheet is at the link below. The goal is to stay together via regrouping as necessary, but we won’t be able to wait long for anyone substantially off the pace.  Please bring navigation aids in case you need to finish on your own, as the ride becomes self-led for those ahead of or behind the group. 

Restrooms:  mi 8 Marina Park, 21 Coulon Park, 29.4 at the coffee stop, and a restroom stop @ Matthews Beach (mile 42).

Food: Quick (20 min. +/-) stop at Cafe Vita mi. 29.4

Cancellation: If weather conditions meet the weather cancellation criterion listed above or if there are unforeseen hazardous riding conditions or other unexpected events, the Ride Leader will post a ride-canceled note in the Comments section below at least two hours prior to the start and Ride Leader(s) will not be at the start location.

IMPORTANT: Each ride leader will make their own weather cancellation decisions independently, so one pace group may cancel while another rides, and one group may take a shortcut, while another may not. An "on the roll"  switch to the rain route is possible. This could change your options for moving between pace groups.

Fenders: Please be considerate of other riders' comfort and safety by using full fenders with long, stable mud flaps (ideally 2" and a maximum of 4" from the ground) if rain is possible or the roads are wet. You may still ride without such long fenders and flaps, but if it's wet you will need to ride at the back of the group (behind all bikes with better fenders). 

Repairs: Be prepared with the equipment and know-how to take care of your own flats and mechanicals, and a plan for getting back to the start if your bike won't take you there (ORCA card or someone to call). If you have a problem the group may stop briefly to make sure you will be OK on your own, but we will not wait for repairs to be completed.

Hope you can join us!



The proof of vaccination or negative COVID test result requirement to enter restaurants in King Co. goes into effect on 10-25-21


Submitted by David Gregg on

Good fenders let us relax and enjoy a safer ride, without the distraction of road spray.

If your flaps are within 4" of the road ("try for 2 but 4 will do") and meet the "Fender Basics" (below) you'll be able to ride up with the group in the "low spray zone".

Few stock fenders are sufficient for group riding, and many off-the-shelf flaps aren't long enough to make up the difference. Please measure; you may need some extra material added to your flaps to meet the 2"-4" spec.


Fender Basics:

1) Don't forget FRONT fenders and flaps

2) Fender WIDTH: they need to be AT LEAST 1cm wider than the tire to be safe and effective (flaps: wider still)

3) Fender CLEARANCE: if debris can get jammed between the fender and tire, it can be very dangerous (especially in front).

4) Fender STABILITY: a fender or flap that moves around may not do it's job (and may be dangerous).


We'll have a brief fender discussion before the ride Monday, so come with questions and comments!


Ride listing error has been corrected. If you signed up for this group, it's a brisk ride, regardless of what the registration might say. There's a separate moderate pace MUMPS group on the calendar.

In addition to the rain route linked above (#2a) here's some options to cut across 520 or I-90 (with rest stops) if conditions dictate:


MUMPS CW 520 shortcut

MUMPS CW I-90 shortcut

Tracy Owen Station/Log Boom Park, Kenmore
17415 61st Ave NE
Kenmore, WA 98028
Ride Leader(s)

Registrations so far...
Moderate: [14-16mph]

2 rider(s)

Brisk: [16-18mph]

1 rider(s)