This is a low-key National Park campground: nothing fancy, but it covers the basics of toilets, water spigots, and a decent amount of space between sites so you and your neighbors don’t have to be besties by the end of the first day. And the whole place is heavily forested, so solar panels aren’t much use and my generator got a daily workout (30-45 minutes or so) to keep the battery topped up.
It’s close to Seattle, though, so that means it gets a LOT of people on the weekends, not only vying for campsites, but also taking day hikes and clogging up the narrow winding road to the campground and beyond (where the day parking is). I’d recommend not trying to arrive on a Saturday or Sunday in the summer for this reason.
Right at the junction of trailhead and campground is a hint of the cool stuff people come up for. When it’s baking in Seattle in summer, it’s way cooler up at Denny Creek and a lot of people have figured this out!
There are two easy hikes, both ending in waterfalls, and I recommend them both as “must do” activities. The easier hike, 2 miles round trip from the trailhead, is Franklin Falls, and you get to see this beauty:
The longer hike up Denny Creek ends in a wide open space, and you can see it’s quite popular in July!
The one big downer for Denny Creek as a campsite is that it is between the eastbound and westbound sides of I-90, so there is constant traffic noise, including big truck engines. In my trailer, keeping the windows closed at night mostly shut out the noise, but in a tent, it has to be much more noticeable, so be warned of that!