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r -~-::~.~ ...-.,-< ".r-' .........~':..."'f.-.- "_ -f-'" :"-::~~ , , l I I I Site 2: Site 2 was a downstream oriented chute channel in Island ParI; (RM 329.7). This backwater had an area of 550 m' and a maximum depth of 20 fL Conditions on February 2, Included average surface ice thicknesses of 0.5 ft with an average 0.9 ft oi Cree water beneath. Site 2 could Dot be accessed during the second !rip, however it is our opinion that due to the general warming trend In February, this backwater remained suitable habitat thrOUghoul me winter. Slle 3: Site 3 Was a downstream oriented chute channel located in Rainbow Park (RM 327.3). This backwater had an area of 1750 m' with a maxiJnum depth of 4.5 ft. This backwater had a slight flow- through during the initial mapping In September, which steadily increased throughout the winter. By February 24, the habitat was effectively a side channel with water velocities of approximately 1.0 ft/Sec. This area was determined to be unsuitable overwinter habitat Site 4: Site 4 was a sllllll1 downstream scour channel localed on a mid-c!lannel sand bar in Rainbow Park (RM 328.5). 'l'his backwater had an area of 110 m' with a maximum depth of 1.3 it By February 24. changes in channelll1orphology replaced this backwater with a W1iform sandbar. No evidence of the original habitat remained. . 6.2.2 Reach 2 Reach 2 enended. from the Split Mountain Campground (RM 319) to me Bonanza Bridge (RM 290). Eight backwaters wete sampled in Reach 2 River ice conditions included minim.' shoteline ice formed the last week of Januaty with surface ice rarely enending more than a meter frolll shore. Frazil ice formed during the first week of Febnwy. Dwillg this time fraziI ice floated to the surface forming large mats which covered most of the water surface in the Jensen area (see Frazil Ice section). The river in Reach 2 was typically free of fraziI ice by 1400 hrs. Frazil ice formed again dwillg the second week of February, however only small amounts were noted. with no significant accumulation on the surf3ce. No ice jams were observed In Reac!I 2 Ice accumulations slowly decreased after peak formation the tim week of February. Most ice was absent by the last week of February. Site S: 'Site 5 was a dOWnstream, chute chanJ1el formed at the bottom of side channel below Chew Bridge (RM 314.7). This backwater had an area of 480 m' and a maximum depth of 3.6 fL This backwater had a slight flow-through during the initial mapping. which persisted. throughout the winter. Ice formation was not substantial. EVCD with the slight flow, this area would have been suitable sheltering habitat dwillg the winll:r. Site 6: Site 6 was a dowostreaID scour channel located at below Chew Bridge (RM 314.7). This backwater had an area of 390 lilt with a lIl3Simum <1cpth of 1.9 fL Surface ice formation was minim~l 1= than 0.1 fL This area had a slight Dow-through on February 23, but was considered suitable habitat during , the winter. Site 7: Site 7 was an upstream oriented. eddy retum-cl1annellocatcc:l just below Chew Bridge (RM 316.2). This baekwater had area of 200 Ill' with a maximum depth of 3.0 fL On February 3, several collapsed ice lenses were noted creating an average surfaCl: ice thickness of 0.2 fL These lenses of thin (0.05 ft) surface ice would rorm during the high daily flow then Q)Uapscd when water stage dropped. These 'lenses' would stack upon each other, forming a mosaic of irregular surface ice. By February 23. solid ice had fanned in lhe back third or the backwater, reducing area of usable habitat 10 130 m'. Despitc the fonn.ation in ice lenses and reduction in habitat, this backwater was considered suitable habitat during Ihe winlef. \3 II II