Mossy Grotto Falls - deep in the heart of the Columbia River Gorge. If you're looking for a serious hike with an amazing reward at the end, this is it. You'll do about a mile of uphill climbing, through a couple of clearings....then a steep downhill over loose rocks and gravel and poison oak. Once you reach the creek, you'll hear the amazing sound of falling water in the distance. Step around a huge house-sized boulder and you will be greeted with this scene. Nature at her finest.