From Brook St, the gravel road heads up a gully towards the Nelson City Council water treatment plant. Codgers Track (Dun Mountain Trail) connects on the left just after the treatment plant. The road cuts back above the plant, and Dun Mountain Trail continues on the right. At the saddle (180 m elevation) there is an intersection between Tantragee Rd, Fireball Rd (access to upper Codgers tracks) and Fringed Hill Rd. Te Ara Kōpiko also starts at the saddle, which you can take as an alternative to the road (note that you can only ride it in the uphill direction). The road descends into Groom Creek gully, passing water treatment ponds and then forks. Here you can either head right and pass through the arboretum to reach the end of Maitai River Walkway, where there is a pedestrian bridge across Maitai River. Heading straight will connect you to Maitai River Walkway immediately down-valley of Maitai Motor Camp, where there is a road bridge across Maitai River to Maitai Valley Rd. A circuit down Maitai River Walkway and up Brook St back to where you started is approximately 11.5 km. There are numerous other tracks that can be taken to shorten or lengthen your route.