Trillium Lake Loop Trail for bikes begins at the end of the Trillium Bike Trail
, although most hikers park in the Trillium Lake Day Use area near the dam. Users wanting to get to the dam and avoid the crowded campground area should turn right from Trillium Bike Trail
and stay on the west side of the loop trail around the lake towards the dam. The trail starts off through a forested area, then begins skirting wetlands with an extensive boardwalk that is in need of replacement. The sections on the south side of the trail near the dam have packed gravel and some bump-outs along the dam for fishing.
The section of the trail at the dam end of the lake has the money shot and should be where the obligatory ride picture should take place. With Mt. Hood's reflection in the foreground of the lake (if it's not too windy or choppy on the lake), it is amazing to see how the snow levels on Mt. Hood change throughout the year.
This trail is best-visited mid-week in summer and before noon or after 5 pm. This lake is one of the warmer swimming lakes on the mountain.