There is a so-called Cathedral Forks trail, it just that it doesn't go up Cathedral Forks. This is the trail description I wrote on bivouac.com.
Follow Wall Creek trail from its junction with Centennial Trail. (Note: this is well to the east and higher up from the confluence of Catheral Forks and Wall Creek.) About 15 minutes from the junction cross a major tributary of Wall Creek. After another 15 minutes where the trail approaches within 20m of Wall Creek there is a trailside camp, possibly with a rusting old airtight stove. Leave the trail and cross Wall Creek on deadfall to its south side. There is another camp here with a food pole and fire ring. The Cathedral Forks Trail is picked up here by heading uphill directly away from Wall Creek. [Do not take the blazed route which parallels Wall Creek.] After 5 minutes the trail climbs steeply onto a hogsback which is likely a medial moraine from extinct glaciers. The trail follows the crest of the hogsback for about 500m and is about 50m above another tributary. It briefly levels out near 1900m before descending about 30m towards the creek valley. The trail from this point on skirts the wet meadows on dry ground staying north of the creek all the way to the alpine. Stay left of the creek and wet meadows and you'll stay on the trail.
The lower meadow in the waypoints is around 1900m. [There is a lesser trail fork near 2000m that crosses the main branch of the creek. It provides no benefit for mountaineering purposes. The lesser fork follows the south branch to a lower saddle.] Just above the lesser fork the main trail swings away from the main branch of the creek. Shortly afterwards it makes a 90-degree turn to the right. Take note of this for the way down. [The trail tread to the left peters out on a dry ridge.]
The trail ends in alpine meadows 2 km west of Orthodox Mountain. From here you can travel easily over high ground to Cathedral Peak and the headwaters of Cathedral Forks.