Hiked it today and added a few other little trails to make it just under 5 miles....one can add even more.
I really liked the terrine, at the top was grassland and loads of red tail hawks. The back side was wooded and mossy. The trail was a little muddy on the back side but one could always get around it.
There were a ton of dogs and many were not leashed - it was the Sunday of a 3 day weekend so maybe there were a lot of not so typical user out today?
Although the parking lot was about 30% full the trail further out was very quiet.
I ran across only 3 mt bikers, all were very nice and used proper trail etiquette.
Another of the area parks that really make Portland stand out for me. It's a nice local spot to get out and stretch your legs, jog, walk the dogs. The perimeter trails are ok for mountain biking, but the park has thankfully started putting up 'no bikes' signs on the central trails close to the visitors center although people still do it and it creates a hazard to have mountain bikes cone zipping downhill on a singletrack where there is heavy pedestrian traffic and large numbers of dogs on leash. If you come here to ride, just start out on the cinder drive on the north and west sides of the visitor center and parking areas, you'll get to the wooded singletrack soon enough and without running people down. Anyway, I rate it higher than 3 stars for a city park, has nice views on a clear day of Mt Hood, Helen, Adams, and lots of wildflowers in season, I usually see deer here in the evenings, and it's a nice way to enjoy nature without even leaving the city, but it's not what I look for when it comes to hiking & trails either.