There are alot of reasons for gates, and not having to "manage" the road is one of the last. I spent almost twenty years as a heavy equipment contractor in the summers, most of it building roads, de commisioning (tearing up) roads, installing and removing culverts as well as building trail for the USFS. Some of the reasons for gates are The road was built for a timber sale and was never meant to be open in the first place, is not to travel standards (safe) and the FS wanted to leave the prism in place for fire access, tree planting, future harvest,weed control etc. There are road density maximums to meet the requirements of the Endangered species Act passed by Congress. In other words no more than x miles of road per square mile of forest. There is not enough money to maintain all the roads. There are so some roads that are closed because of sensitive easily eroded soils, and for the fact that in the past ten or fifteen years idiots have trashed to many really nice places. iT IS DAMN EXPENSIVE TO GRADE, MAINTAIN DRAINAGE AND CULVERTS, AND DO EROSION CONTROL, NEVER MIND PICK UP THE ABANDONED CARS, REFRIDGERATORS AND PILES OF GARBAGE THE PUBLIC LEAVES IN THE BACKCOUNTRY. I know, doing exacltly that kind of work payed for my kids college education. I am not a fan of the USFS, they can be as dysfunctional an orginization as any, but by and large they are a just a bunch of folks not to much different than most of us trying to do a thankless job with to little money, and they have to try and please everyone, from the most rabid, I can do any damn thing I want asshats to the don't step on a flower, no motors except in my Prius idiots. If you want to know why a local road is closed go ask at your district, my guess is you will get a answer.