Distance: 12.9 km (4.5 DOC hours) - Unmarked route, clear - Easy terrain
Altitude: 649m to 817m. Gain: 4m. Loss: 172m . Gradient: 1 deg (Gentle)
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

Gentle (difficulty: 2/5)
Gentle slopes

Easy (difficulty: 1/5)
Grass / prepared surface

None (difficulty: 1/7)
No alpine skills required

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

None (difficulty: 1/7)
No alpine skills required

Noticeably faster walking down the valley.

Note: Described in the reverse direction to your journey

Exact route changes of course with the river conditions, but the general idea is take the shortest route point to point crossing the main stream with care as required. There is a wet weather track/route on the TR which is needed if the river is up at all but the river bed is far faster.