I might warn you while it might seem like archtecture and Civil would go well together VERY few people can do both and even few are good at both. Reason is because they use oppisides of the brain. The CE side is heavy left brain and the Archtecture side is heavy right brain. Very few people are strong with both 1/2 of the brain. The people I knew who dual normal struggled at one or the other and most of them ended up dropping one of the majors.
I'm not a CE, but I did stay at a Holiday Inn Express last night...
And I have been burned by enough CEs that I tend to do the bulk of my grading myself rather then let it slip out of my control. No, I didn't major in CE, but I do it as a part of my right-brain job.
Although, in the interest of full disclosure, when that spinning woman image was posted that was supposed to tell you which side of the brain you use, I could see it going one way sometimes and the opposite way other times.
OP- If your ultimate goal it to be designing buildings, don't worry about what engineering type you select. Frankly, for an M.Arch degree, most colleges won't care what your engineering background is. You'll be heading for endless studio time, where the laws of physics are suspended, and hot melt glue is considered a moment-resisting connection.
And don't think you'll be designing buildings anytime soon after graduation. You'll likely be designing toilet room layouts for a while. It's hard to be a good designer without an intimate knowledge of materials and construction methods -- and that knowledge only comes through time.
Having said that, it should come as no surprise that I find the work of Louis I. Kahn to be some of the most interesting, thoughtful architecture around. To paraphrase Kahn, "I asked the brick what it wanted to be, and it said 'an arch'". Understanding of materials is key.