Okay so when we left for this trip early morning on 5/15, we were not aware this specific trail was closed. I think WTA just updated it after we got there. Especially since there are reviews on Alltrails spanning the whole month. I called the Cowlitz station for trail info about a different trail and I guess it was my mistake to assume the area was open. There are no signs at any of the 3 trailheads saying it's closed, except for the lower river falls parking lot, which has been closed since September for bathroom installation. There are signs for Ape caves and camgrouds right by this that are marked closed, but for some reason they have not physically marked this one yet. We parked by the street parking near the bridge, but there were also cars parked in the upper falls lot. It was an amazing day of solitude for 5 whole hours of the waterfalls to ourselves, but I can't help feeling guilty for enjoying it since it was supposed to be closed... So I hope if you're reading this, you can avoid my mistake and respect the closure! Call the ranger district directly related to the trailhead you're interested in to get reliable and recent information. 

we were 7 at hike, and the road was not bad, only couple bumpy area..snow started when we in to back country road to train head..u need 4x4
when we started hike snow started drop more..and on trail closing point we came near upper fall but trail turns left and it takes you upper fall..on that way another tree down..we past true but if does more can be close or after can be block your exit..so be careful if you thinking pass true..because we saw cracked ground area on trail road which can be landslide..i don't recomented pass that point to go upper fall..it may already close too..
when we start back snow was continue and already around 2" on the road..so you need 4x4 cars..and watch weather report and road report before go..back country road to area kind of tight when you drive you will close to edge  and can be dangerous with snow condition..beside all it was beautiful are, and river had more water..we only made lower and upper falls..i will post full hike video on youtube..find my channel  https://www.youtube.com/watch?v=kHUmP7pNNyQ&t=54s

The Lower Lewis River parking lot and campground are closed for construction of a new toilet.

To access Lower Lewis River Falls, drive 1 mile up the road to the middle trailhead and hike the Lewis River trail downstream. The trail and the falls viewpoints are open.

The trail that goes upstream to Middle Falls from the middle trailhead is also blocked off (2nd photo).

Hiked from the middle falls parking lot down to the lower falls. Beautiful hike for fall foliage and the falls itself was breathtaking. Lots of bright yellows and oranges on the trail, and the forest itself was beautiful! We saw just a couple other parties on the trail and for the most part felt like we had it all to ourselves.

The trail from the lower to middle falls was closed (I think due to landslides?) at the junction with the "lower" trail up to the middle falls parking area where we had parked, cutting off the triangle. To visit the middle falls we would have had to go up to the lot, then down the "upper" trail in the direction of the upper falls. We opted not to as we were losing light.

Do take time to read the interpretive signs around the viewpoints for the falls to learn a little bit about the relationship between local indigenous people and this place.

Hiked from Lower Falls to Middle Falls. Round trip 7.1 miles and 1260 feet climbing. Was in day parking by 10am and trail quiet until we returned towards the lower falls, when party peeps were out with coolers, floaties and all sorts of fun stuff. Highly entertaining. Beautiful stroll and a nice swim at the end!