13.3 miles
1,976 ft
-1,999 ft
Avg time
Trail Supporters, Builders & Maintainers of Henry Hagg Lake Trail

Henry Hagg Lake Details

  • Difficulty rating
  • Trail type
  • Bike type
    AM, XC
  • Trail Usage
  • Direction
    Both Directions
  • Climb Difficulty
  • Physical rating
  • Season
  • Global Ranking
  • Land Manager

The trail around Hagg Lake is a close-to-portland Gem, with over 13 miles of single track, and a little over a thousand feet of climbing. The trail is generally muddy and unridable in the winter (in other words this is *NOT* a winter ride destination). The rest of the year it can be great, but sometimes gets overgrown with blackberries and other greenery. This is some Poison Oak present off-trail.

The NWTA Bike Patrol was first initially focused on patrolling this trail with Memorandum of Understanding with Washington County.

There is only one trail which circumnavigates Hagg Lake. Many folks prefer to ride clockwise, but those who ride it much seem to prefer counterclockwise.
Many folks like to go just across the Dam (left right after entering the park), but I prefer to go to the next (smaller) parking lot past the big dirt one. Then I ride back across the dam.
There are quite a few places where hiking/fishing trails cross the loop trail, but if you take a wrong turn you can't go very far.

NOTE: There is access fee. See misc section below for details.
This trail offers a lot of amazingly fun riding as well as a little taste of each of the worst things western oregon has to offer for mountain bikers. Fortunately, each of those worst things is generally easy to avoid or adapt to if you know what to expect and know what to avoid.
Things to Avoid:

1. Avoid open, sun drenched and low lying meadows at all costs during the summer growing season. It isn't humanly possible to keep up with the overgrowth in these areas. If there is a sign that says "Ecologically Sensitive" find the nearest spur and ride up to the road and bypass it. This isn't to protect the area, it's to protect you. In western Oregon, the ecology is sensitive like a rabid alley cat. It's easy for you to cause some damage, but you're going to get hurt in the process. The trail is heavily rutted through this area and the vegetation has grown in to conceal some very dangerous potholes and deep ruts. There are deep holes full of prickly things that'll swallow you and your bike no problem.

2. Watch out for spurs that descend to the lake. There are a lot of little fishing trails that are easy to get lost on.

3. Watch out for swimmers on the trail! These are not the typical savvy outdoorsman hikers you're used to running across on trails. These people don't get out in the woods a lot, they're wearing flip-flops, and they don't know trail etiquette. Just get out of their way, be very patient, and offer encouraging smiles and a good attitude. They're often blocking the trail on the North side near the overgrown ecologically sensitive meadow kind of close to where the creek enters the reservoir. That's one more good reason to just bypass that area by using the road. Also, as a side note, I would really suggest you DON'T offer these people your opinion about their behavior, no matter how stupid. Remember that they're also drinking and they're probably a bit more uptight than your average mountain biker.

4. Poison Oak: There is some. It's mostly on the south side under the trees. Be careful.

So, if you've managed to avoid the prickly and rutted open meadows, the rest of this trail is pretty sweet! All the tree covered parts are amazing. Just go clockwise, the trail undulates wildly with a pretty randomly even mix of rolling hills throughout. There are few sustained climbs but a lot of short steep ones. Keep your momentum up and make sure you're in the right gear and you'll be fine. There's still sporadic undergrowth encroaching on the trail under the canopy, but nothing that even approaches the disaster going on in the meadows. Seriously, the canopied parts of this trail are a blast! You'll probably have to bail and walk the bike quite a few times, which means you're having fun, right? The best way to enjoy this trail is to take the nearest spur up to the road every time you see a meadow, then drop back in where you think it goes through the forest. This is especially important right after the bridge that crosses the inlet creek. When you hit that bridge, stay on the road for a couple of miles until you see a tiny parking lot on the right side at 45.49498, -123.21833 and you'll hit what is by far the best part of the trail as it undulates for about 4-5 screaming miles back to the dam.
So, stay out of the meadows, and this is an awesome trail.

The Clockwise Loop - Go across the damn after entering the parking lot, then park at the large parking lot on your right, just across the damn. From there, ride down the road to a small paved pull-out parking area, and head down the trail.
Soon you'll cross a bridge that NWTA helped construct, then you will come to a picnic area and the large Boat Ramp C area, where there are bathrooms and a food vendor (and water).

Continue on the south side of the lake, going clockwise, until you come to the west end of the lake, where the trail dumps you out on the road. Continue around the west end of the lake, going about 1/4 mile until you see the trail jump into the woods again. This enters the Butterfly area. Be careful to stay on the trail here.
Continue until Boat Ramp A. You are dumped on the road a couple of times, but carefully ride along the right side of the road and jump back on the trail when you see it.

After Boat Ramp A it's only a mile or two to the damn, going behind the Ranger Station (fenced with chain link). Ride back across the damn and you are at your car with a smile!

The Counter-Clockwise Loop" - Start as you do for the CW loop, but ride the other direction. Be sure to be careful when on the road, since you will need to get off the trail, cross the road, go a little ways, cross the road again to the next section of the trail. Watch for cars, but this direction is preferred by some.

The Sain Creek Out and Back -- Drive on south side of lake to the Sain Creek area, park carefully off the road, and ride CCW on the trail, which enters from the road there. Head until the NWTA bridge, then back.
The Boat Ramp Loop -- Some like to park at Boat Ramp A, since it has water, bathrooms, and a bike wishing hose. Otherwise, the loop choices are the same.

NOTE: Always be careful of hikers and fisher persons when on this trail, especially on the weekends, and especially around the Boat Ramps and Picnic area.

Access Info

HWY47 south of Forest Grove, head west on Scroggins Creek Rd. Fee Area! Self Service at the gate! $5, Annual Passes available. You can pick up this trail literally anywhere around the lake.

Local Trail Association
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More Stats for Henry Hagg Lake mountain bike trail
  • Altitude change
    -23 ft
  • Altitude min
    304 ft
  • Altitude max
    421 ft
  • Altitude start
    332 ft
  • Altitude end
    310 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    5.5 miles
  • Distance down
    6.3 miles
  • Distance flat
    1.6 miles
  • Avg time
  • view trail stats
on Sep 4, 2016
Very Dry
Avg: 2.5 (2 votes)

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Henry Hagg Lake Trail Reports

Sep 4, 2016 @ 2:36pm
Sep 4, 2016
Trail is in great shape with the exception of one bridge currently under construction. The bridge is by Nelson Road on NE side #32 on...
Jun 28, 2016 @ 5:30am
Jun 28, 2016
The loop was dry and fast. There's a lot of overgrown greenery. Ended up with lots of small cuts on my arms and my buddy left with a bloody lip...
Feb 21, 2015 @ 10:30am
Feb 21, 2015
Mostly OK. There are mud pits you will want to walk around.
Nov 30, 2014 @ 7:19pm
Nov 30, 2014
Sloppy this time of year.
view all reports »


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