Distance: 11.3 km (8.0 DOC hours) - Unmarked route, clear - Moderate-hard terrain
Altitude: 103m to 1140m. Gain: 1082m. Loss: 45m . Gradient: 6 deg
Skills: - Occasional rivers (3/6)

Unmarked route, clear (7/9)
Unmarked route, follows obvious geography (river, spur, trail, etc)

Primary, unmapped (2/5)
Route not on maps, but is principal access to hut or along range / catchment

Unknown (difficulty: 0/5)
Not specified

Moderate-hard (difficulty: 4/5)
Tall, walkable scrub / large rocks, occasional waterfalls or gorges in rivers

Unknown (difficulty: 0/7)
Not specified

Occasional rivers (difficulty: 3/6)
Occasional rivers - impassible after heavy rain

Unknown (difficulty: 0/7)
Not specified

No description

Note: Described in the reverse direction to your journey

Moir's guide has a very good description of the Otoko River route. The route varies between some boulder hopping, some short scrub sections and generally fairly open bush; there are numerous deer trails.