8208

• UCREFRP Catalog Number: 8208
• Author: Osmundson, D. B., P. Nelson, K. Fenton and D. W. Ryden.
• Title: Relationships Between Flow and Rare fish Habitat in the '15-Mile Reach' of the Upper Colorado River.
• USFW Year: 1995.
• USFW - Doc Type: \
• Copyright Material: NO

Table 4. Minimum flow levels (in cfs) known to have provided suitable depths for a given habitat
type within a given season. Less than (<) signs indicate that these depths were met with flows less
than the lowest monitored (557 cfs). Greater than (>) signs indicate that the flow listed did not
provide suitable depth but suitable depth was provided at some flow between the listed flow and
the next highest flow monitored. Flows in parentheses are minimum flows needed after bed
sediments were flushed in 1991.
Summer Winter
Habitat Transect Max Depth Ave Depth Max Depth Ave Depth
ED 5 <557 <557 <557 <557
PO 10-5 X557 >900 (<557) 2!810 (<557) >5,020 (>2,870)
BA-1-U 3 >5,020 >11,200 >2,870 >9,170
BA-1-M 4 >4,426 >11,200 >2,870 >7,620
BA-2-U 7 >2,870 >7,620 >1,630 >2,870
BA-2-M 8 >4,426 (>557) >9,250 (1,630) >2,870 (<557) >5,020 (>900)
FR-1 1-B <557 >1,240
FR-2 12 <557 >2,870 (557)
FR-3 2 X557 >1,530
FR4 6 <557 >557
SR-1 1-A >2,870 >5,020
SR-2 10-N <557 >1,530
SR-3 11 <557 <557
Table 5. Transects where suitable depth was provided by the recommended flow.
Habitat Transect Max Depth Ave Depth Max Depth Ave Depth
Summer. Moderate-to-High Flow Year (1,630 cfs) Winter. (1,630 cfs)
ED 5 Yes Yes Yes Yes
PO 10-S Yes Yes Yes No
BA-1-U 3 No No No No
BA-1-M 4 No No No No
BA-2-U 7 No No No No
BA-2-M 8 No (Yes) No (Yes) No (Yes) No (Yes)
Summer. Low-Flow Year (810 cfs)
FR-1 1-B Yes No
FR-2 12 Yes No (Yes)
FR-3 2 Yes No
FR-4 6 Yes Yes
SR-1 1-A No No
SR-2 10-N Yes No
SR-3 11 Yes Yes
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