Just rode the entire trail with my daughter, Oct 16 and 17. We started in Council Grove and rode East. We were on hardtail mountain bikes.
From Council Grove to Osage City the trail is in absolutely perfect condition. It's wide, (10 -12 feet),smooth, hard and fast. Many times I thought I was riding on pavement. I even locked out my front fork because I didn't need it. All the bridges are new. Guys with road bikes, have fun you'll fly. Congratulation to the Parks Dept for all their work, this portion is as good as it could be.
Then you hit Osage city. Oh boy, time to unlock the fork. From there to Vasser it's pretty rough. You come to HW 31 on the East side of Osage City and your looking at a overgrown weed patch along the junkyard. The sign said it's the trail so we went. There is still a pretty good gravel base so just pick your line and go. Then heading east go through the parking lot at the grain elevator and the trail stops at 5th st. There is no signage. We just kept going straight because there were no " private property" signs. It's all grass no path. Then at 6th street you have to detour to the south on Lakin Street. Ride Lakin east and turn left at Sonic then North back to the trail. It's a very short detour, no big deal.
From here to Vasser, again it's hit and miss. Some sections are OK and others are pretty rough. We were lucky because it hadn't rained in a while and trail was bone dry. There are lots of sections that are just dirt that would very tough if it was muddy. There was one section just as you go over the bridge at HW 75 that was very fine deep loss dirt. It was dry and we still had to ride in the weeds on the shoulder where the ground was hard to get through. If that was muddy, forget about it.
From Vasser east the trail goes back to the " improved" condition.
We got off at HW 368 and went north and camped at Pomona State Park.
Very nice park with facilities. There is also a good restaurant on the left by the motel and golf course. Open all day.
Back on the trail in the morning and through the only tunnel on the trail under HW 268. Like I said from here on the trail is back to the " improved" condition. Not quite as nice as from Council Grove to Osage city but still very good. Just a few more bumps and chatter.
Lot of dead trees down but that was because of the bad wind storm we had the night before. We weren't in a big hurry so we just cleared them ourselves.
I did run into a parks truck doing maintenance and got a lot of good info.
That bad portion through Osage City is waiting on some bonds for funding and that eventually the trail is going to have bathroom facilities, water and mile markers just like the Katy. They already have mile markers from Ottawa to Osawatomie.
Anyway heading east we ran into a big detour at Iowa rd. The trail is closed there or should I say non existent. You have to take the detour which is well marked and takes you out on the country gravel roads. The roads aren't bad. It's not the " big" gravel you think of when you hear " gravel road" but fine crushed gravel very similar to what's on the trail. The detour is about 3.5 miles and you get back on the trail at Louisiana Ter. At this point your about a mile West of Ottawa.
From Ottawa to Osawatomie the trail is in great shape but some of the bridges haven't been replace or updated yet. There are about four or five with no railings. Most aren't very high but one is about 30'. I just mention this in case someone is taking some young kids. On that big one I don't know why they couldn't a least put in a couple posts and at least string some cables just so there is some protection.
The trail now does go all the way to the Karl E Cole baseball complexe and ends there in nice big parking lot.
I hope this update was useful. Reading older posts when I was researching this trip I was expecting the worse but i can tell you that we had a great time and the trail is in great shape with that one section and detour as the exceptions.

Carl Spahn with daughter Madison
Kansas City, Mo.

Rode the trail starting in Osawatamie. Trail was in great shape, though some parts had a lot of leaf coverage. Despite this, no issues with surfaces or slippage. Such a peaceful trail to ride. And it flows super fast.

This is a nice, short trail. We walk our dog on it almost daily. Flat terrain, both woods and open fields. The trail also connects to the disc golf course in Marquette.

I just started riding, this trail is amazing and beautiful! Can park in beautiful park in Goddard and ride either East or west. West toward Garden Plain has beautiful bridges. Well kept Trail thankful to those who keep it up!

40 miles of outstanding trail. Rapid improvement of Flint Hills nature trail due to its designation as a state park. From Osage city to Allen the trail is 20 feet wide of crushed lime stone. From Allen to Council Grove 15 feet wide crushed lime stone with rock formations and fossils on both sides. Bathrooms,food, and water in Osage city, Allen, and Council Grove. Camping available in multiple sites along the way.

It was a very windy day, but as this trail runs East - West and the wind was out of the north it was doable. Nice ride with plenty of shade and good rural views. I rode my recumbent with street tires and did okay. Watch out for the big gravel between Maize and Tyler Street(?). Other than that the crushed limestone was fine, but not much pavement so don’t look to hard for it. Limited food service near trail, but two bar/restaurants in Garden Plain. We ate at The Other Place and food was very good. The owners were very accommodating to us, helping to secure our bikes In the patio area. We felt very welcomed there! Extremely friendly along with the other folks we chatted with in Garden Plain. Good ride for lunch from Wichita.

A fantastic trail with great facilities in Goddard.

Rode all but really easternmost mile from Garden Plain. About 24 miles or so round trip. Fantastic condition and highly recommend this trail.

This is a great Bike Path. Although, I highly recommend to bike during the day as there are a couple areas along the way that are a bit sketch. There are several stops on this journey. I will definitely ride on it, again.