the melting of stetionary blocks of glacial ice. The greatest
measured depth in the lake immediately up-stream from the mouth
of Wheaton Creek was a sounding of 65 feet below river-level. |
Numerous tributary creeks join the eastward-flowing stretch of |
Turnagain Fiver. These from west to east are: Tumble (Falls),
Ball, Little Greenrock, Greenrock, Two-Mile, Wheaton (Boulder),
Bobner, Ferry, Flat and Hard Creeks. A significant thing about
them all is that they enter the Turnagain over falls. The

drop of Wheaton Creek is 60 feet: the others are comparable.

In general, the streams in the upper ends of the tributary vaill—
leys flow on a gentle grade. They steepen down-stream, then
fall into the main valley. Their valleys are hanging in rela-
tion to that of the Turnagain.

Wheaton Creek joins the Turnagain about 7 miles east of
the right-angle bend, just at the 129th meridian. The head of
the creek is 4 miles west of King Yountain. Although the creek
is not perfectly straight its general course is almost due
north to the Turnagain. Two small unnamed tributaries enter
it from the east near its head and farther down-stream it is
joined, again from the east, by Alice Shea and Philippon
Creeks (see Fig. 1). From its head Wheaton Creek flows 5
miles slightly east of north, then gradually bends and flows
for 4 miles slightly west of north to its junction with the
Turnagain.

In the 4-mile stretch below Alice Shea Creek, Wheaton
flows in a canyon which in places is 100 feet deep. Above
the steep canyon-sides the upper valley-walls are flaring and
rise gradually to more or less flat-topped ridges and higher
peaks on each side. Up-stream from the canyon-section, the
valley is wide and open with gently rising sides. This valley,
in the lower course of the creek, is incised to form the can-
yon-section.

Although the creek flows in the bottom of a steep-sided
rocky canyon, its actual course in sections is slightly me-
andering. In such sections there are narrow gravel benches
or alluvial flats from 50 to 200 feet wide and only a few feet
above creek-level.

In general, the longitudinal profile of Wheaton Creek
(see Fig. 2) has a very low grade in the upper part of the
stream. The grade becomes increasingly steeper towards the
mouth until finally the creek drops over a 60-foot fall into
the Turnagain River flat.

In particular, (see Figs. 1 and 2) Wheaton Creek, up-
stream from a point about 4,500 feet above the mouth of Alice

= Gee