Recently I attempted to hike this trail with a friend. We had been wanting to do it for some time, and eventually there was a day that seemed amenable regarding the weather and our schedules. I will talk a little about some of the gear I used/wore too.
Section A is the most strenuous part of the trail. Section B is closed indefinitely. Section C is open and apparently less strenuous, but we didn't do that part. The weather forecast showed a high temperature of about 76 degrees Fahrenheit, and the sky was partly sunny. I'm glad there was some cloud cover; it would have been worse if it were fully sunny.
We got started on the trail (entrance to Section A) at 13:10 and it took us about two hours to complete the first half of that section. There were some places we stopped to observe the view, and others where we stopped to rest for a little bit.
After finishing the first half, there is a short exit trail you can take so you don't have to do the final section of the main trail. We used the exit trail because I felt that I wasn't prepared correctly to continue on the main trail. Signs before the start of the trail recommend not hiking during 10 a.m. to 4 p.m., the hottest part of the day.
I wore Teva Hurricane sandals, which was a less than ideal choice. It wasn't a catastrophic mistake, but in the future I would want to wear closed-toe shoes with a good amount of traction in the soles. Probably some kind of trail running or approach shoes, something like that.
I do not recommend wearing original Teva sandals because they don't have as much traction on the soles compared to the Hurricane version. The Teva Hurricane sandals have been suitable for other short hikes, but this trail was considerably more strenuous than others and involves portions of rock scrambling where it's better to have closed shoes so you can jam your foot in places and not worry about getting scratched up.
The rocks also have edges/points that you sometimes have to step on, so it's better to have a shoe with a stiffer sole so you won't feel a rock edge jabbing into your foot as much. The Teva Hurricane shoes are the absolute bare minimum type of shoes you should wear, but ideally wear something else (trail running or approach shoes, or even full hiking boots). I saw some people wearing regular sneakers or even canvas shoes (similar to Vans) but I personally would not wear shoes like that for this hike.
Information online from the NPS suggests bringing 2 liters of water per person for this hike. I would heed this suggestion, as it's better to be prepared instead of getting dehydrated and needing to be rescued because you can't make it any further. There are water fountains near the closest parking area (admission to the park is $20 for vehicles, and $10 for pedestrians or cyclists), but otherwise there are no other places you can get drinking water. Another source recommends bringing twice much water as you usually drink (this is kind of vague) and consistently drinking the water every few minutes.
Personally, I drank about 2 liters (possibly a little more) by the time we reached the turn for the exit trail, where there is a sign suggesting you take the exit trail if you're running low on water and/or feel tired. If we had completed the full main trail, I think I would have finished at least 3 liters of water. Keep hydration in mind and bring enough water so you don't run out, especially if it's a warm or hot day. I brought 5 liters of water in a water bag (in addition to a full 1 liter bottle), which was inside my backpack. I shared some of the water with my friend, but he didn't drink that much in total.
Other things I would do differently are to use bug spray and sunscreen. I thought the trail would be relatively shaded, and while there are parts in the shade, the rock scrambling sections are pretty exposed to the sun. I got a number of itchy bug bites. I would also want to start the trail earlier, possibly around 9 a.m. or something like that. Additionally, going on a day when it isn't as warm could be better. I would also want to bring a brush to brush off the dirt from certain areas so you can get a better grip. Bringing a small (i.e. lightweight) pair of binoculars could also be interesting so that you can get a better view of some of the scenery in/across the river.
There were numerous sections of the rock scrambling areas that I found difficult because of the distance between good foothold or places to step. To some extent, better shoes could have helped with this because it would increase the amount of locations that I could comfortably put my feet, but some of it was just due to me being short (5'0") and my legs weren't long enough to comfortably reach the next foothold in a stepping motion. The alternative was to do more of a jump or hop, which felt too treacherous especially with the shoes I was wearing, or to do a more complicated pivoting and/or crawling maneuver.
It was good to do the trail on a day that wasn't very busy so we didn't have to worry about a lot of people waiting behind us on the trail during the scramble areas, or for us to have to wait behind other people.
In the future, I might just want to take the exit trail inwards to the midway area, then resume the main trail from that point.
Although my preparation for the hike was less-than-ideal, it wasn't so inadequate that it was catastrophic. However, apparently many people have to get rescued from the trail, so I wanted to be mindful about bringing more than enough water, and using the exit trail when I realized I should have prepared differently. It would be embarrassing and a hassle to have to be rescued from the trail.
I could also be in better shape, weight and endurance wise. I wouldn't recommend this trail if you are too unhealthy and/or inexperienced with hiking, especially more complicated terrain with a lot of elevation and scrambling.
The backpack I used was an Osprey Sirrus 24 (liter), which was a decent size to carry the 5 liter water bag plus a few other things (small pouch, 1 liter Nalgene in the side pocket, a bucket hat, a small sketchbook, a pee funnel that I did not need to use, but just in case...), and it felt pretty comfortable to wear.
Although there were some people we saw on the trail who didn't bring substantial backpacks, I wanted to make sure I had enough water, plus get a chance to use this backpack. It has a frame and the back panel of the bag is suspended about an inch from a mesh panel that touches your back, so you can get some airflow there. It has a hip belt and sternum strap, both of which help to stabilize it. The hip belt is comfortable and helps distribute the weight. I found this backpack on sale at REI for about $50, but full price is $180.
The Sirrus is a women's-specific design and I found it a good size for me at 5'0" (in terms of the backpack relative to my body). It is a little bulky due to the frame and hip straps so I don't think I'd necessary want to use this in an everyday (non-hiking) context, even though that was what I was looking for when I went to REI. At REI, they have a cabinet in the backpacks section with weight bags so you can test how a given amount of weight will feel in a certain backpack!! It's kind of dangerous to go to REI since there's so much stuff there that I'm tempted to buy....
I wore a new Columbia shirt (thin quick-dry fabric) and old, lightweight Under Armour running shorts that have pockets. I'm glad I didn't wear thick or warm clothing because the weather was rather warm. I brought a bucket hat but didn't wear it. I did wear a bandana to keep the sun off my hair though. This is a necessity for me in the summer if I'm going to be outside in the sun for awhile.
In addition to the Billy Goat Trail section A, there are a few other things you can look at in this area. There is a Great Falls overlook right off the canal towpath near the parking area. There's also a boardwalk trail that goes on Olmstead Island and is pretty scenic. In the future, it might be nice to do the boardwalk Olmstead Island trail by itself and stop at the overlook to draw, but we were too tired to draw since we had already done part of the Billy Goat trail before going to this area.