Have always loved the IRT - it is truly one of the best trails in the Lehigh Valley. I generally use the Chestnut Street or Saylor Park trailheads so I can choose if I want to do just the loop or the loop and spur section.

I was also pleasantly surprised that the ENTIRE trail is paved now! The last section of the spur route used to be crushed stone, but is now paved. This makes for an awesome ride.

Overall, it is a fairly flat loop with a spur should you choose to do it. On the loop, there is a hill that starts at the spur entrance and goes toward the Chestnut Street trailhead, then turns downhill to Saylor Park. On the spur route, there is a slight brief uphill as soon as you turn onto it, before you go under the Route 145 bridge. The scenery changes throughout the loop from dense woods to town parks to homes and apartments. The spur route is much more countryside, with the ruins of old industry and trains along the way.

The road crossings on the loop route are very manageable and since you are in towns most of the time, traffic moves slowly and/or is very good about yielding. This is a bit of a different story on the spur route, which has some busy road crossings, namely South Church Street (second crossing after bearing off on the spur) and Mauch Chunk Road (last crossing on the spur route). Mauch Chunk is especially dangerous with cars moving at a high rate of speed - there are signs on the trail warning that it is a dangerous intersection. However, all crossings are well-signed - it just seems to me that vehicle operators on the faster country roads along the spur route generally do not yield to you.

The only other compliant is toward the end of the spur route, the trail passes directly behind a very busy gun range. Although there are cement walls and fences dividing the trail from the range (and the range is pointed away from the trail), it can still be a bit unnerving to hear rounds being fired so close to the trail.

Overall if you pick one trail in the Lehigh Valley to try out, make it this one - you won't be disappointed!

This is likely a lesser used portion of the trail, and my review covers from the Fort Washington State Park trail heading northward. It is a trail that will appeal to mountain bikers and walkers. The starting point is not obvious from the parking lot, but can be deciphered relatively easily. The trail starts out packed gravel and flat and winds through some scenic areas. One then crosses a long bridge, and ahead is a fork, where one wants to take the right fork. There is a road crossing ahead, and it switches to macadam and remains relatively flat. One crosses under an old railroad bridge, and up a steep hill where the macadam ends. With heavy rains recently, there is a lot of erosion and the trail is very rocky. There are some steep stretches, and dips, and with the bicycle I had, I had to bail from the trail. I did see people further ahead on foot, and it appeared pleasant enough. It should be spectacular in fall colors. It is a relatively short trail, and families were walking along. I only give this portion three stars due to its difficulty unless one has a mountain bike and the need for repairs to the erosion. Although a recently fallen tree had been cleared, so there is some attention given to the trail.

Yesterday I went on this trail on my full suspension E bike. I discovered my bike was capable. I, on the other hand, am perhaps not capable.After recent storms the steep sections of this trail are washed out and very rough. I think I will stick to rail trails in the future.

I only did 40 miles of the trail staring in New Brunswick; did enjoy it. I was impressed by the difference in temperature provided by the tree canopy during a good portion of the trail. My only concern, especially when riding with children, is that little attention has been given to traffic intersections. Too many drivers are careless and could prove hazardous. An enjoyable trail otherwise.

I was really pumped to go for a long run on this trail, heard nothing but amazing things. But it seems TS Henry and Ida took its toll on this path. LOTS of washouts, bridges closed and areas completely washed away. I’m sure it will get fixed in time but just be cautious for the time being

We rode this portion of the D&R trail two years ago, and thought we'd do it again yesterday. Started at the trail head along Carnegie Road at Lawrenceville, and rode for about 2 1/2 miles going north-east (we were plaining on doing 20 out and 20 back) . That was enough to decide to pack it up, and go to another trail closer to home. I guess, because of the heavy rains we had in August/September, to repair wash-outs, they just threw very fine gravel down, not packed, and in many places about 2" thick. It made for miserable riding on our cyclocross bikes with 32mm tires. Whoever is in charge of the trail maintenance needs to educate themselves of proper materials and techniques to be used for the trail repairs. Maybe it got better as you got further away from Lawrenceville, but we weren't going to chance it. A real shame, it used to be a great trail.

We enjoyed this quiet mostly shaded trail! Took our 2 dogs. I like that it’s paved, pretty scenery, not real busy.

Some say the Delaware River Trail is the best in NJ. My vote is for Columbia Trail. The only negative is that it is a bit short at 15 miles. The trail is usually wide and well maintained, I've never seen it crowded, but I'm retired and use it during the week. The canopy of trees keeps it cool in the hot summer days of July and August and the turning leaves are spectacular in the fall. About 12 miles from High Bridge, in the town of Long Valley, is a great little coffee shop, the Coffee Potter, that sells pastries and really good coffee and teas. If that isn't enough, less than half a mile from the trail at the same intersection, you can ride to a group of three restaurants, a brew pub, a Latin restaurant, and and All American Cuisine restaurant. Beginning at High Bridge there is some minor elevation. I suggest starting there, so that coming back is easier.

Most of the trail is crushed stone, but there are sections of really hard dirt and some short stretches that might better be described as gravel, as well as a paved section - also very short. There are a few places intersections where a cyclist has to cross a road, but they aren't very busy. Still, caution is always recommended. I've ridden it with no problem with both a hybrid and a gravel bike, and that's what most riders use, but I've seen road bikes navigate the trail with no difficulties. A mountain bike would be fine, but isn't necessary.

Although this is an easy ride, if you're miles from your car and have a breakdown, it's still a problem. Bring the usual necessities in case of flat or other fixable breakdowns because of that distance. Watch for deer and other wildlife. I understand there are black bears, but I've never seen one. Bring the family. Enjoy.

Although the trail is noisy because of its proximity to Rt. 202, it is beautifully maintained, asphalt all the way and offers pleasant views. Very hilly headed south but fun downhills on the northward journey.