Biological Opinions - Bureau of Reclamation

Table 8.2 UKL end-of-month elevations in ft, February through June, at the 5 to 50 percent
probability levels based on KBPM modeling of the proposed action using POR data (USBR
2012, Table 7-2). ................................................................................................................. 135
Table 8.3 The percent area at UKL spawning sites that are inundated to at least 1 ft (0.3 m) depth
between lake levels of 4141.0 ft (1,262.2 m) and 4142.5 ft (1,262.6 m; Reclamation 2012,
Table 6-1). ........................................................................................................................... 136
Table 8.4 Potential emergent wetland habitat at the Williamson River Delta under different UKL
elevations, based on data in Elseroad (2004) and a GIS analysis of topographic data, and
assuming no inundation of emergent vegetation occurs below 4139.0 ft (1,261.6 m). ...... 139
Table 8.5 UKL end-of-month elevations (in ft), April through July, at the 5 to 50 percent
probability levels based on KBPM modeling of the proposed action using POR data
(Reclamation 2012, Table 7-2). .......................................................................................... 140
Table 8.6 UKL end-of-month elevations (in feet), July through September, at the 5 to 50 percent
probability levels, based on KBPM modeling of the proposed action using POR data
(Reclamation 2012, Table 7-4). .......................................................................................... 143
Table 8.7. Water depths at the entrance to Pelican Bay at various UKL elevations. The
minimum bottom elevation at the entrance to the bay is approximately 4133.5 ft (1,259.9 m;
Reclamation 2012, Table 7-10)........................................................................................... 144
Table 8.8 Clear Lake surface elevation probabilities in ft for the period of 1903 through 2012
(USBR 2012, Table 6-3). .................................................................................................... 156
Table 8.9 End of the month surface elevation probabilities in feet for Gerber Reservoir, 1925
through 2012. Source: USBR 2012, Table 6-4. .................................................................. 160
Table 11.1. Hardy et al. (2006) and Hardy (2012) reach-level study sites used by NMFS for
analysis. ............................................................................................................................... 203
Table 11.2. List of critical assumptions made to address uncertainties. ..................................... 207
Table 11.3. Impaired water bodies within the action area. ......................................................... 216
Table 11.4. Modeled suspended sediment concentrations, exposure durations, and likely effects
to coho salmon under existing normal conditions (50 percent exceedance probability), for
Klamath River at Seiad Valley (RM 129; USDOI and CDFW 2013). ............................... 240
Table 11.5. Modeled suspended sediment concentrations, exposure durations, and likely effects
to coho salmon under existing extreme conditions (10 percent exceedance probability), for
Klamath River at Seiad Valley (RM 129; USDOI and CDFW 2013). ............................... 241
Table 11.6. Percentage of days exhibiting daily flow changes of at least 30 cfs for the proposed
action and observed discharge at IGD. ............................................................................... 257
Table 11.7. Flood frequency analysis on Klamath River for IGD gaging station observed daily
discharge and proposed action daily discharge for the period of record from 1981-2011. 263
Table 11.8. Exceedance table for proposed action daily average flows (cfs) at Iron Gate Dam. 266
Table 11.9. Daily average mainstem flows (cfs) where the proposed action will likely reduce
coho salmon fry habitat availability to below 80 percent of maximum (orange highlight).
............................................................................................................................................. 270
Table 11.10. Daily average mainstem flows (cfs) where the proposed action will likely reduce
coho salmon juvenile habitat availability (blue highlight) in the Trees of Heaven reach. . 272
Table 11.11. Daily average mainstem flows (cfs) where the proposed action will likely reduce
coho salmon juvenile habitat availability (blue highlight) in the Seiad Valley reach. ....... 273
Table 11.12. Daily average mainstem flows (cfs) where the proposed action will likely reduce
coho salmon juvenile habitat availability (blue highlight) in the Rogers Creek reach. ...... 273
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