Help: I accidentally applied a 12‑ft lane width (AASHTO) to a forest trail – how do I fix the erosion nightmare?

I keep replaying the moment I mixed up my design sheets on the weekend. I was working on re‑routing a 3.2 mile ridge‑top trail near my town and, for some reason, slapped the AASHTO‑standard 12‑ft lane width (CROW 15‑15) onto it.\n\nWhat happened next:\n- The trail now runs side‑by‑side with a 2 % cross‑slope, far beyond the recommended 5 % for footpaths.\n- My “design speed” of 30 km/h, a metric borrowed from urban arterial planning, translated into an illegal 7% gradient on parts of the trail.\n- I forgot to run an LRFD check, so the culvert I sized at 300 mm diameter is crumbling under peak runoff – the whole thing flooded after last night’s storm.\n\nBottom line: I turned a gentle hikers’ corridor into a miniature highway. The locals are already calling it “the concrete scar” and the erosion is scarring the hillside harder than any bulldozer could.\n\nI know I should’ve stuck to the AASHTO Green Book footpath recommendations – 1.5‑2 ft clear width, max grade 10%, side‑drainage every 30 m – but I was too caught up in the CAD “clean lines”. Anyone else slipped up with cross‑disciplinary standards? How did you back‑track (literally) and restore a trail without tearing up the entire segment again? I’m braced for the heat if I have to redo the whole thing.