7789

• UCREFRP Catalog Number: 7789
• Author: FLO Engineering, I.
• Title: Green River Jensen Spawning Bar & Escalante Wetlands Hydrologic Study.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

• The cross sections in the intervening reach between the last spawning bar cross
section (E-5.2) and the upstream wetlands cross section (E-14) were subject to a
variety of responses which are discussed below:
•E-6 and E-7 displayed a normal range of bed elevation variation of ± 1 ft.
•Cross section E-8 experienced greater change in the bed elevation with a range of
variation of ± 2 ft and the thalweg was relocated toward the right bank.
• The cross section plot (Exhibit A, sheet 2) demonstrates that E-9 experienced
dramatic changes. Three feet of deposition near the left bank was offset by 4 feet
of scour near the thalweg. The thalweg elevation did not change.
•Approximately 1 ft of scour occurred across three-quarters of the E-10 cross
section from the left bank.
•The E-11 cross section also experienced significant changes. The thalweg shifted
from the left side to right side of the channel replacing 4 ft of deposition and 3 ft
of scour.
• Finally, both E-12 and E-13 experienced scour. E-12 developed a new thalweg
5 ft deeper. E-13 scoured the mid-channel 4.5 ft and left a 6 ft sand bar deposit
on the left bank (inside of the bend).
• The upstream cross sections (E-14 & E-14.5) in the wetlands reach (E-14 thru E-18)
were also active during. the period from April to August. E-14 scoured the thalweg
2 ft deeper. E-14.5 experienced a uniform bed drop of about a foot.
• Left overbank changes at E-15 were the result of excavation to create a higher dike.
The remainder of the cross section showed some scour and deposition.
• Thalwegs are found along each bank at E-15.5. The left thalweg filled about 2 ft.
The center bar dropped by a couple of feet.
• The remainder of the wetlands cross sections were very active and the changes are
discussed in the following comments:
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