PROJ00297

• Contract/PO #: C153507
• Contractor Name: Greeley, City of
• Contract Type: Loan
• Water District: 3
• County: Larimer
• Bill Number: SB 87-15
• Loan Projects - Doc Type: Feasibility Study

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extended 51 feet upstream wi th 36-i nch di ameter rei nforced concrete pipe in
1966. In 1985 the old conduit upstream of the wet well was repaired by
grouting in place a 32-inch diameter steel liner. The original concrete
horseshoe section downstream of the wet well has been patched several ti~es
over the years with mortar and epoxy. The intake to the outlet conduit is
fl ush wi th the stream bottom and the openi ng is protected by a steel trash
rack. Di scharge at the downstream end of the condui tis controll ed by a
flared concrete energy dissipator. Flow through the conduit is controlled
from the crest by a manually operated sl ide gate located at the downstream
side of the wet well.

Inspection of the inlet, wet well, and conduit showed them to be in fair to
good condi ti on. A log of the i nspecti on is i ncl uded in Appendi x A. The
concrete pipe and steel section upstream of the wet well were in good
condi ti on. Driftwood debri s was present in the i nl et chamber, and sand and
gravel debri s had accumulated for a di stance of approximately ten feet into
the conduit. Downstream of the wet well the conduit was clear. The wet well
was also in good shape with only a few ~inor cracks. Some sand and gravel had
accumul ated at the sunken floor of the wet well and erosi on was observed
underneath the gate sill plate, although it had not undermined it co~pletely.
The gate and operati ng stem were rusty but appeared to be in sati sfactory
operating condition. The conduit downstream of the wet \'/ell, through the
original concrete arch, was judged to be in good condition. Minor erosion has
occurred at several horizontal construction joints, associated with the method
in which the conduit was originally constructed which produced feathered edges
of concrete separated by tar paper. A few minor cracks were observed with
evidence of some seepage infiltration. Patching of defects carried out
previously appeared to be of good quality. Very little erosion of the invert
concrete was observed.

The energy di ssipator at the condui t outl et is severely deteri orated and in
poor condition. The wall s are cracked and the floor sl ab has been eroded so
that in several places reinforcing steel is exposed. The downstream end of
the structure has been undermi ned and 1 arge porti ons of concrete floor sl ab

2084H

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