title
Flaming Gorge Reservoir and Green River post-impoundment investigations : annual performance report 1975
author
Array ( [0] => Starostka, Victor [1] => Wilson, George [2] => Wiley, Robert [3] => Dufek, David )
abstract
UDWR Publication Number 76-20
date
1976-01-01
organization
Utah. Division of Wildlife Resources
species
Array ( [0] => Not Specified )
file_path
https://grey-lit.s3.wasabisys.com/flaming-gorge-reservoir-and-green-river-post-impoundment-investigations-annual-performance-report-19.pdf
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content
r N 4650F6. 13: Fla/ t:/75 - f - - __;_J -_FLAMING _GORGE RESERYOJR_ - - AND GREEN RIVER - POST-IMPOUNDMENT 1NVESTIGATIONS 639.3758 UTA COPY 1 ANNUAL PERFORMANCE R-EPORT -1975 . PUBLICATION NUMBER 76-20 Din~elJ-Johnso;. Project Number F-28-R-4 STATE OF UTAH DEPARTMENT OF NATURAL RESOURCF.s DIVISION OF WILDLIFE RF.sOURCES John E. Phelps, Director PROPERTY OF UT AH WILIX.ifE RESOURCES LIBRARY FLAMING GORGE RESERVOIR AND GREEN RIVER POST-IMPOUNDMENT lNVESTIGATIONS Annual Performance Report March 1975-December 1975 Victor Starostka Project Leader George Wilson Project Biologist Robert Wiley and David Duf ek Contributors PROl'ERTY CF UT AH W!UJ'LifE R!:'.;OU::.CES U!.'.M.Y Publication Number 76-20 Dingell-Johnson Project Number F-28-R-4 Copyright © Utah State Division of Wildlife Resources 1976 An Equal Opportunity Employer Donald A. Smith Director LIST OF TABIES •• LIST OF FIGURES. JOB NUMBER TABLE OF CONTENTS F-I. MEASUREMENT OF RESERVOIR FISHERY HARVEST, PRESSURE, AND SUCCESS • • •• • •••••• F-II. IMPACT OF MULTI-IEVEL OUTIETS ON FLAMING GORGE RESERVOIR AND DOWNSTREAM WATERS ••• F-III. RESERVOIR FISH MARKING AND STOCKING. F-IV. FLAMING GORGE TAIIWATER CREEL CENSUS ••• F-V. TAILWATER FISH STOCKING AND MARKING •• F-VI. INTERSPECIFIC RELATIONSHIPS OF THE WHITE SUCKER IN FLAMING GORGE RESERVOIR. . ··:. -: LITERATURE CITED. • • • • • • • • • • • • • • Pa.ge iii iv 1 6 9 22 37 40 LIST OF TABLES Table 1. 1975 Flaming Gorge creel census summary with 1974 figures in parentheses. Percentages indicate change from 1974. . . . . . . . . • • . • • • • • • • 2. Summary of trout harvest information, Fla.ming Gorge Reservoir, 1963-1975 ..........••. , .. 3, Numbers of trout checked during 1975 Flaming Gorge creel census with percentage of composition in parentheses • . . . . • . . • . . • . . . . . . 4. Fish stocking summary by species and agency for Flaming Gorge Reservoir, 1975. • •.. 5, Comparison of returns from the 1972 plant of three inch rainbow trout and the 1973 plant of five inch rainbow trout, Flaming Gorge Reservoir •.•••. • 6. Percent age composition of the rainbow harvest from Flaming Gorge Reservoir, 1970 through 1975 by age groups . . . . . . . . . . . . . . . . . . • . . 7. Catch per gill-net hour of fish captured in the canyon area, Flaming Gorge Reservoir ••••.• 8. Catch per gill-net hour of fish captured in the open area, Flaming Gorge Reservoir .. ••... 9. Catch per gill-net hour of fish captured in the inflow area, Fla.ming Gorge Reservoir •.• 10. Mean total length (TL) of fish captured in gill nets, Flaming Gorge Reservoir 1963.1975, ....•.... 11. Mean percent occurrence of food items in stomachs of lake trout collected from Flaming Gorge Reservoir, Utah, 1974-1975. Number of stomachs examined in parentheses. • • • . . . . . . .•..• 12. Mean back-calculated TL of Flaming Gorge Reservoir rainbow trout, 1970-1975 . . • . . . ....• 13. Creel census summary, Green River tailwaters, 1975. 14 . Comparison of creel and catch rates of Snake River cutthroat and rainbow trout, Green River tailwaters, 1975 (catch rates in parentheses) .•.•.•.... Page 3 4 6 11 12 13 15 16 17 19 20 21 23 24 Table Page 15. A comparison of angling pressure (angling hours per mile) on the Green River tailwaters, Utah with other 16. areas . Species composition of the harvest, Green River tailwaters, 1975 (percent in parentheses. 25 26 17. Condition factors (TL) (numbers of fish in parentheses) of fish collected from the Green River tailwaters, May 31-August 16, 1975. . . . . . . 28 18. Comparison of the average total length of age cl.ass I+ rainbow trout creeled from different river selections, Green River tailwa.ters, 1974-1975 . . . . . . 29 19. Average monthly recorded river temperatures, Green River tai lwaters, 1974. . • • . • . . . . • . . • . 30 20. Monthly average length (mm) of creeled rainbow and Snake River cutthroat trout, Green River tailwaters, 1975 (sample size in parentheses) . . . • • . . . . • . 32 21. Percent length-frequency distribution of rainbow trout, Green River tailwaters, 1967-1975 . . . . . . . • • 33 22. Comparison of angler use and effort estimates, Green River tailwaters, 1967-1975 . . • . • . . . 34 23. Mean daily discharge flows (acre feet/day), Green River tailwaters, 1963-1975. . • . • . • • 36 24. Estimated number of marked rainbow trout fingerlings per 1,000 feet of side channel, Brown's Park, Green River tailwaters, 1975-1976 . • . . . . . . • . . • • 38 25. Mean length, weight and condition of white suckers taken from gill nets, 1969-1975, Flaming Gorge Rese~oir . . . . . . . . . . . . . . . . . . . . . 41 LIST OF FIGURES Figure l. Flaming Gorge Reservoir. 2. Selected temperature and dissolved oxygen profiles from Log Boom and Bear Canyon , Flaming Gorge Reservoir, 1975. . . . . . . • • • • . • • • • • • Page 2 9 MEASUREMENT OF RESERVOIR FISHERY HARVEST, PRESSURE , AND SUCCESS Job F-1 Fla.ming Gorge National Recreation Area experienced a resurgence of visitor use after a decline i n 1974 . Visitor day use (VDU) was 721,300 during 1975 compared with 652,800 VDU in 1974 or a 10.5 percent increased VDU. Angl ing continued t o comprise a substantial portion of VDU. Duri ng 1975, 20.2 percent of the total VDU was directed toward fishing. Mean f isherman length of stay in the National Recreation Area was 2.3 days and the mean angling day was 4 . 1 hours. Reservoir creel census consisted of road blocks and traffic counters on major access roads to determine t raffic classification and expansion factors. Area pressure, angler days, angler hours and harvest were determined from data collected during angler interviews. Reservoir elevation was similar to 1974. The reservoir filled to capacity (1841 m, 6040 ft) creating approximatel y 42,000 surface acres (Fig . 1). Harvest decreased by 6 .1 percent during 1975 to 752,981 fish while angler hours increased 4.9 percent to 1,749,625 hours (Table 1). The net result was a decrease in catch rate from 0,49/hr in 1974 to 0.43/hr in 1975. Harvest estimates show that creel rates have been declining since the first year of the fishery (Table 2). However, total harvest has remained at about 20 pounds of trout per surface acre; a very good harvest when compared to similar reservoirs and many warmwater fisheries. Data in past progress reports show that fishing pressure has generally increased through the years. -2- GRUN RIVER BLACKS FORK RIVER inflow area BUCKBOARD t 0 kilometers 6 open hills area WYOMING UTAH GREEN RIVIR canyon area FIGURE 1 FLAMING GORGE RESERVOIR -- -3- 'I'able 1. ~975 Flaming Gorge creel census summary with 1974 figures in parentheses . Percentages indicate change from 1974. Area Angler Angler hours Fish/hr Harvest Canyon 120,429 495, 830 0. 53 264,431 +5.2% +19.9°/o +26.2°/o (114,483) (413,710) (0.51) (209,833) Open hills 257,705 1,o66,866 o.41 435,499 +2.2% +l.7o/o -16 . 5% ( 252,o68 (1,049,472) (0.50) (521,368) Inflow 51,535 187,208 0.28 53,051 +3, 5% -9.CY/o -21.9°/o (49,794 (205,762) (0.33) (67,936) Total 429,669 1,749.625 o.43 752,981 +3,2% +4.9°/o -6.1% (416,345) ( 1, 668 , 669 ) (o.49) (799,137) Boat - Shore Fishing Relationship Boat 260,154 1,130,004 o. 50 559,297 +l.3% +6.6% -0. ?}1/o (256,781) ( 1,o60,553) ( O. 53) (561 ,123) Shore 169,515 619,621 0.31 193,684 +6 . 2% +1.9°/o -18 . 6% (159,564) (608,391) (0.39) (238,014) Fish/Hour by Area and Boat-Shore Canyon Open hills Inflow Boat 0.61 o.47 0.29 Shore o.4o 0.28 0.24 - -4- Table 2. Summary of trout harvest information, Flaming Gorge Reservoir, Est . Yield Mean Acres No . Year Catch/hour (lb/acre) Wgt. (lb.) Stocked Stocked/acre 1963 5,797 575 1964 1.23 18.2 18,965 213 1965 1.28 20.8 0.54 20,762 78 1966 0.78 26 .1 1.02 30,959 56 1967 0.62 24.5 1.05 28,579 79 1968 0.58 19.4 1.00 27,692 100 1969 0.56 19.2 0.90 25,291 116 1970 o.44 14. 7 0.96 23,897 143 1971 o.4o 8.o 0.95 31,103 132 1972 0.60 18.0 0.78 39,862 164 197J* 0. 57 20.0 0.91 38,o67 71 1974 o.49 20.0 0.86 38,100 68 1975 o.43 15.6 0.77 38,940 85 lf-First year 5 inch rainbow trout stocked. -5- Heasons for the continued decrease jn catch rate are not readily apparent. 'Phe catch rate remained steady throughout the Jear except t'or a sli17ht peak in ,lune and ,Tuly. Mean size of rainbow trout creeled was 321 mm and 349 g . 8rown trout averaged 332 mm and 431 g. The mean length and weight for brown trout may be underestimated since most large brrn-m trout are creeled ( <'luring late fall and early spring) when creel census effort is light. Ma11:v large trout ·.-1eighing more than 4. 5 kg continue tc be taken from Flaming r.orge enhancing the reservoir's "troph:v fish'. reputation. ('reel composition was as followr: rainbow trout, 95.1%; br .0 8 .8 10 .6 4. o 4. 8 7, 6 2 .6 3. 6 j ( ') - 4 U 4 40 5- 42 4 12 .3 6 .4 18 .7 4. 9 1. 9 3, 5 1. 8 2 .2 42 5- 44 4 5 .2 8 .o 5, 5 2 .8 1. 9 6 .9 0. 2 1 .6 44 5- 46 4 2 .0 3. 2 4. 6 3. 4 2 .9 6 .3 0 .5 o. 6 46 5- 48 4 2. 4 4 .o 3 ,7 4 .9 2 .1 3, 5 o. 4 0. 5 48 5- 5o 4 1. 6 4. 6 1. 5 2 .4 2 .1 1 .1 o. 4 50 5- 52 4 2 .3 0 .9 1 .9 2. 8 0 .9 0 .5 52 5- 54 4 1. 5 0. 5 0. 2 0. 2 54 5- 56 4 1. 4 o .6 o. 8 0 .7 0. 1 56 5+ 1. 4 1. 2 1. 2 2 .8 0 .1 T o ta l nu m be r m ea su re d 25 3 12 5 21 7 32 6 37 5 14 4 55 1 82 1 , I w Av er ag e (m m 2 si z e w I 34 0 34 5 38 6 29 5 31 2 35 6 28 5 29 2 Table 22. Comparison of angler use and effort estimates, Green River tailwaters, 1967-1975. Estimated anglers (angler hours) per mile Year Upper section Lower section Total (7.2 Miles) (22 .4 Miles) (29.6 Miles) 1964 (--) (--) 98 ( 301) 1965 (-- ) ( --) 277 ( 720) 1966 (--) (--) 402 (1,331) 1967 3,587 (10,537) 339 (2 ,168) 939 (4,202) 1968 3,793 (10,232) 339 (2,269) 1,179 (4,2o6) 1969 2 , 92 0 ( 6, 762 ) 204 (1,376) 865 (2,679) 1970 3 , 199 ( 10 , 2 78 ) 289 (1,591) 995 (1,466) 1971 1,812 ( 5,079) 170 (1,01'.::) 570 (2,003) 1972 2,377 ( 6,944) 301 (1 , 882) 8o6 (3,113) 1973 1,790 ( 6,363) 211 ( 638) 595 (2,384) 1974 1,769 ( 5,690) 178 705) 565 (1,917) 1975 1 ,167 ( 4, 795) 255 (1,101) 477 (2,000) -35- River Flows Mean monthly discharges in acre feet per day for 1964 -1-975 are presented - in Table 23. During 1975 monthly discharges varied considerably, with r ecord monthly releases during ~lune and July diminishing to below average flows during September and October. Flows stabilized to near normal during November. The pattern of f low and amount of discharge appeared to influence angler use and effort more than the catchability of trout. Traditionally, ,June and Ju ly are the months of highest angling pressure but during 1975 angling pressure peaked in August as f lows diminished (Table 23) . Monthly creel rates varied considerably but did not appear to be correlated with monthly discharge . _ Table 23. Mean daily dischar ge flows (acre feet/day), Green River tailwaters, 1963-1975 . Year 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 11 yr . mean ,June 2,907 2,934 3,120 6,455 3,392 3,649 3,030 3,374 6,438 6,057 4,424 6,944 4,793 July Aug . 4,8m 3,955 969 1,000 3,415 3,856 5,501 6,023 6,478 6,552 5,155 6,368 3,988 Li ,317 3,841 5,017 6,037 5,459 5,321 6,925 2,863 4,603 8,783 6,450 5,197 5,502 Sept. Oct . Nov. 4, 255 4,821 4, 572 1,h7L1 2,544 3,971 4,o46 3,959 2,800 6,045 6,232 5,487 6,140 4,630 4,680 5,855 4,405 4,474 3,999 2,059 2,404 4, 707 3,961 5,777 3,199 6,214 7,112 5,353 /1 '708 5,048 4,683 5,826 4 .898 3,179 2,914 4,318 4,812 4,752 5,o49 Source - Bureau of Reclamation Hydrometer ological ]Jata Mean 4,221 2,149 3,533 5,957 5,312 4,984 3,299 4,363 5,743 5,568 4, 594 5,431 -36- TAIIWATER ns1-1 STOCKU!(; A.llJD MARKING
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