Geology Report - Cooper Mountain-Bull Mountain - Water Area A BRIEF DESCRIPTION OF THE GEOLOGY AND GROUND-WATER CONDITIONS
IN THE
COOPER MOUNTAIN-BULL MOUNTAIN GROUND-WATER AREA
WASHINGTON COUNTY, OREGON
by
David H. Beach and Wm. S. Bartholomew
This report will address the question of the determination
of a critical ground-water area in the vicinity of Cooper Mountain and
Bull Mountain in Washington County, Oregon. Following the public hearing
of May 7, 1973, a written report will be available to inform the well
owners, water well contractors, well drillers and other interested
persons or agencies of the geology and ground-water conditions existing
in this area.
Cooper Mountain and Bull Mountain form an upland area located
a few miles southwest of the geographic center of the Tualatin Basin.
Owners of some domestic wells within the area have found it necessary
to deepen their wells in order to maintain an adequate domestic water
supply. The water levels in some wells within this portion of the
Tualatin Basin have been declining since the year 1948. A water level
decline of 6 to 10 feet per year has been recorded in some observation
wells near the main pumping centers. The continued overdraft of the
basalt aquifer system in the area has reduced the available ground
*4100 V
water supply and may soon impair the usefulness of this aquifer within
the area. The proposed boundary line for the area is indicated by a
broad broken line shown on the maps attached at the back of this report.
The area of the proposed critical area covers approximately
41 square miles surrounding Cooper Mountain and Bull Mountain. To the
north, the area is approximately bounded by Butternut Creek which
drains to the west to enter the Tualatin River which forms the western
and southern boundaries. On the east and northeast, the area is
bounded by the Tualatin Beaverton Highway No. 217. The area includes
portions of the cities of Tigard, Beaverton, Tualatin, and all of King
City. A more detailed description of the exact boundaries of the area
will be described in the published report following this hearing.
Oregon's Ground Water Act of 1955 recognizes and declares a
state legislative policy under ORS 537.525. Paragraph 8 and 9 of this
statute reads as follows: (Paragraph 8) "Depletion of ground water
supplies below economic levels, impairment of natural quality of ground
water by pollution and wasteful practices in connection with ground
water be prevented or controlled within practical limits.,, (Paragraph
9) "Whenever wasteful use of ground water, impairment of or interference
with existing rights to appropriate surface water, declining water levels,
interference among wells, overdrawing of ground water supplies, or
pollution of ground water exists or impends, controlled use of the
ground water concerned be authorized and imposed under voluntary joint
2
. 'fir+' '�✓'
action by the State Engineer and the ground water users concerned
whenever possible, but by the State Engineer by the police power of
the state when such voluntary joint action is not taken or is ineffective.'
ORS 537.730 of the Ground Water Act provides for the initiation
of a proceeding for the determination of a critical ground water area.
The State Engineer may initiate such a proceeding whenever he has
reason to believe that: (a) ground water levels in the area in question
are declining or have declined excessively; or (b) the wells of two or
more ground water claimants or appropriators within the area in question
interferes substantially with one another; or (c) the available ground
water supply in the area in question is being or is about to be over-
drawn; or (d) the purity of the ground water in the area in question
has been or reasonably may be expected to become polluted to an extent
contrary to the public welfare, health, and safety.
In matters of ground water occurrence, the hydrologic charac-
teristics of individual ground water aquifers is directly related to
the various geologic formations and structures that occur within the
proposed critical area. Where the rock is hard and has resisted
weathering, the surface is likely to be thin and poor and not suitable
for croplands. Where the rocks are deeply weathered and crumbled into
deep soil, rich in minerals, the land may become valuable for farming.
We find that the rocks we live on are responsible in one way or another
for our productivity and our available ground water resources.
3
The floor of the Tualatin Valley has been formed as a broad
valley plain varying in elevation from 250 feet to 110 feet above mean
sea level. Cooper Mountain and Bull Mountain have been formed as high-
lands that stand above the valley surface. They reach maximum elevations
of 785 feet and 710 feet above mean sea level respectively. The major
drainage within the critical area is by way of the Tualatin River and
its tributary streams. Much of the annual rainfall is prevented from
entering the ground-water system and is rejected as surface runoff to
the meandering low-gradient Tualatin River.
The oldest geologic formations within the area are not
exposed at land surface. They are composed of marine sediments similar
to those composing the Coast Range Mountains located at the west end
of the Tualatin Basin. These rocks are composed of tuffaceous sedimen-
tary sand and clay deposits which are usually very fine-grained and
have poor water-bearing characteristics.
The main water-bearing formations in the area are the basaltic
lavas of the Columbia River Group. The formation is composed of a
series of accordantly layered basaltic lava flows. The top and bottom
surfaces of individual lava flows are often permeable and form good
water-bearing zones. Jointing and fracturing of the solid rock forma-
tions provide some space for the storage and movement of ground water.
Three wells within the area have penetrated the entire thick-
ness of the Columbia River Basalt formation. The Aloha-Huber Well No. 1,
4
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the Aloha-Huber Well No. 2, and the Jane Hackman well known as the
Texaco Oil Exploration well penetrate the basalt to depths of 695
feet, 855 feet, and 1,029 feet before entering the underlying marine
clay deposits. Therefore, the thickness of the basalt within the
critical area varies between 650 and 1,000 feet in thickness.
The Columbia River Basalt formation forms one of the two
principal aquifer units within the area. Fine-grained sedimentary
materials overlying the basalt formation in the Tualatin Basin form
the other major fresh water aquifer. The water-bearing characteristics
of the sedimentary formations are generally poor due to the fine-
grained nature and large amounts of clay contained in these basin
fill sediments. The sedimentary formations have been developed primarily
as water supplies for single family domestic and stock water uses.
Deep wells have been constructed into the basalt aquifer by
residents living on Cooper Mountain and Bull Mountain. These domestic
wells vary from 200 to over 600 feet in depth and encounter the
original water table at an elevation of approximately 150 to 200 feet
above mean sea level. Large yielding wells capable of producing up
to 1,000 gallons per minute have been constructed and are used for
municipal, irrigation, and industrial water supplies within the area.
Newcomb and Hart (1965) pointed out in U.S.G.S. Water Supply
Paper 1697 that many domestic wells near Cooper Mountain and Bull Mountain
are drilled in the deep basalt formations. Many of these wells do not expose a
5
V *400
sufficient thickness of the basalt below the water table to insure an
adequate water supply. It is common for drilling to be stopped when
the domestic well reaches a few tens of feet below the top of the
water table. Such wells often skim the top of the water bearing forma-
tion. Domestic wells on the top of Cooper Mountain often have low
yields due to limited penetration of the aquifer and high pumping lifts
due to topography or height above mean sea level (m.s.l.).
GEOLOGIC STRUCTURE
The geologic formations within the Tualatin River Basin are
composed of horizontally bedded sediments, volcanic lava flows, and
volcanic sedimentary debris. The present day position of these rock
formations within the Tualatin Basin is evidence of the subsequent
folding and faulting which has occurred within this area. The Tualatin
Basin was slowly warped into a bowl shaped synclinal valley. Smaller
scaled anticlinal folds have created ridge lines which have formed
both Cooper Mountain and Bull Mountain. Field mapping and well log
information indicate a number of abrupt changes in the geologic
structure within the area. Sharp folding and possibly some faulting
displacement has occurred in the more competent lava rocks of the
Columbia River Basalt formation.
The position of the basaltic aquifers within the structure
of the Tualatin Basin generally determines whether the basalt is
economically within reach beneath the valley floor or whether it stands
so high above the water table in the upper areas that only limited zones
6
of perched ground water can be developed. It is possible that some
structural barriers also exist within the area and may be responsible
for changes in the position of the water table. Shattered rock along
fault zones may permit saline ground water to move upward from the
underlying marine sediments into fresh water aquifers of the Columbia
River Basalt formation.
Surface water and ground water are interrelated parts of the
hydrologic cycle. The ground water in the Tualatin Valley like its
surface water counterpart, originates as precipitation. Precipitation
falling on the land surface percolates downward through the water table
and recharges the ground water body. The ground water body underlying
Cooper Mountain and Bull Mountain does not appear to be receiving
adequate recharge to meet current withdrawals. The dense clay soil cover
on the upland surface tends to reject much of the annual rainfall. The
numerous deeply incised and closely spaced stream gullies and canyons
occurring on the flanks of both Cooper Mountain and Bull Mountain drain
much of the annual precipitation to tributary streams entering the
Tualatin River.
It is estimated that approximately 3 to 4 inches of the annual
precipitation enters the basalt aquifer as recharge. Climatological
records at Hillsboro indicate that Cooper Mountain and Bull Mountain
receive an average of about 40 inches of precipitation each year. More
than 80 per cent of this precipitation occurs during the months of October
through March. The massive basaltic lava flows have poor vertical
7
permeability, in contrast to their lateral permeability. Dense
poorly permeable lava flows divert the downward movement of water into
laterally permeable interflow zones. Surface springs occur where the
diverted ground water is forced to land surface along the flanks of
the uplifted areas of Cooper Mountain and Bull Mountain.
Normally, the position of the water table fluctuates seasonally
and responds to the addition of recharge water during the rainy season
and it is also affected by ground water withdrawal from pumping wells.
The maximum observed water level fluctuation of record within the area
was 39 feet as recorded in a well located within the SEA of the SWk
of the SFA of Section 13, Township 1 South, Range 2 West. The minimum
water level fluctuation observed was about 3 feet and occurred in a
well located in the NE'k of the NWk of Section 4, Township 2 South,
Range 1 West. An average annual fluctuation of the water table within
the proposed critical area is about 8 feet.
Water levels in the basalt aquifer vary from 50 to 100 feet
below land surface at low altitudes to more than 500 feet below land
surface near the crest of Cooper Mountain. The ever increasing pop-
ulation and development within the critical area has expanded the use
of the limited ground water supply within the area. Ground water stored
within the fractured basalt formations has been estimated to be 1 to
3 per cent of the total saturated volume of the rock aquifer. During
8
the ten year period between 1960 and 1970, water levels have declined
60 to 80 feet in the Aloha-Huber municipal wells, 90 feet near the
Beaverton city well, and 70 feet near the Tigard city wells.
If water levels continue to decline within the basalt aquifer,
it may become uneconomical to develop deeper water supplies. It is
possible that some of the deeper basalt wells may become contaminated
by the intrusion of saline ground water from the underlying marine
formation if the water levels drop far enough.
At the present time, we have no accurate way of calculating
the exact amount of ground water being withdrawn from the basalt
aquifer within the area since all wells producing water from this zone
are not equipped with totalizing water meters. We have estimated the
amount of water being withdrawn from the critical area aquifers for
the years 1970 to 1972.
1970 1971 1972
in ac. ft. in ac. ft. in ac. ft.
Exempted ground water use 357 359 382
Municipal ground water use 3872 3543 3485
Irrigation ground water use 1800 1800 1800
Industrial ground water use 167 167 167
6196 5869 5834
The extensive and enlarging cones of depression and depressed
pumping levels around the municipal well fields show that an outside
source of water mast be obtained within the reasonable future. The
9
municipal water districts who have taken steps to obtain additional
amounts of imported surface water to augment or supply their municipal
water needs have recognized this problem.
The State Engineer is making water level observations in 18
regular observation wells located within the ground water area near
Cooper Mountain. Seventeen additional wells have been added to this
observation net bringing the total number of observation wells in the
area to 35 wells. Hydrographs for each of the 17 observation wells
on the state net show the annual water level decline and will be in-
cluded as part of the State Engineer's report on the area.
CONCLUSIONS
(A) The use of water to meet increasing municipal, industrial,
and irrigation needs has created a ground water mining situation in
the basalt aquifers of Cooper Mountain and Bull Mountain. Unless there
is an increase in the amount of recharge to these aquifers, or a
reduction in the amount of ground water withdrawn, there will be a
continued water level decline in the order of 6 to 8 feet per year.
New low positions will be established each year until it would become
impossible to obtain the present amount of ground water withdrawn from
this ground water reservoir system.
(B) The continued decline of water levels within the basalt
aquifers may result in the upward movement of saline ground water from
the underlying marine formations, although there is no evidence collected
to date to show that this will occur within the study area.
10
RECOMMENDATIONS
(A) The area around Cooper Mountain and Bull Mountain should
be declared a critical ground-water area.
(B) The basaltic aquifer of the Columbia River Group within
the critical ground-water area should be closed to further development
except for domestic and stock water uses.
(C) All water wells (other than exempt wells ORS 537.545)
should be equipped with totalizing water meters.
(D) All wells operating in violation of ORS 537.535 should
be regulated and controlled.
(E) Ground water withdrawal from wells within the critical
aquifers should be regulated and controlled as provided by ORS 537.735
and 537.745. Some pumping restrictions are required for the control
and management of ground water within the area. The watermaster should
regulate the control works of all wells within the area so that the
rate and the total quantity of ground water withdrawn does not exceed
that allowed under their ground water rights, certificates, or permits.
The procedure for distribution and ground water regulation should be
as set forth in ORS 540.040.
(F) If continued growth within the proposed critical area is
desired, it will be necessary to import water from outside sources so that
ground water withdrawals can be reduced.
11
TABLE 3
ABSTRACT OF GROUND WATER FILINGS FOR THE COOPER-BULL MOUNTAIN GROUNDWATER AREA
Priority Appl. Permit Cert. Permitted Max. Cum. Well
No. Record Holder Date No. No. No. Diversion Acreage Allow.* Rights* Use Location
I. The U. S. National Bank 1918 GR-3990 GR-3599
of Portland, Trustee 20-25 gpm 3.0 7.50 7.50 Irr. 26aac 1S 2W
2. Virgil Bish 1922 GR-3872 GR-3522 33 gpm 4.1 10.25 17.75 Irr. 3dbc 2S
3. Wm. A. Schurman 1924 GR-3632 GR-3326 4.5 gpm 2.0 5.00 22.75 Irr. 19cac 1S
4. Ray Kincheloe 1932 GR-3681 GR-3375 80 gpm 14.0 35.00 57.75 Irr. 23bdd 1S 2W
5. J. Richard Smurthwaite Prior to GR-2540 GR-2400 18 gpm 2.0 5.00 62.75 Irr.
123dbd 1S 2W
938
6. Leslie T. Wright 8/9/38 GR-2846 GR-4038 50 gpm 6.75 16.88 79.63 Irr. 13dcd 1S 2W
7. John B. Peyton 1940 GR-2834 GR-2670 12 gpm 0.51 1.28 80.91 Irr. 30abd 1S 1W
8. Anton G. Hauptman 5/42 GR-3533 GR-4052 10 gpm 0.75 1.88 82.79 Irr. 18db 1S 1W
9. Edna E. Barron 2/44 GR-2376 GR-2258 80 gpm 5.0 12.50 95.29 Irr. 19dad 1S 1W
10. Robert 0. Malsey 1945 GR-343 GR-328 950 gpm 1532.12 1627.41 Mun. 21cdd 1S 1W
(City of Beaverton) #2
11. Lewis C. Martin 7/12/46 GR-3194 GR-409610 gpm i 1.25 1628.66 Irr. 19dac 1S 1W
12. Arthur A. and ac.
2/17/47 GR-4030 GR-3631 12 gpm 2.0 5.00 1633.66 Irr. 25abd 1S 2W
Mildred Tauscher
-13. Tigard Water District #1 4/47 GR-616 GR-588 200 m
14. J. S. Higgins gpm 322.55 1956.21 Mun. llbcb 2S 1W
gg' 5/20/47 GR-3364 GR-4062 8 gpm 2.0 5.00 1961.21 Irr. 19ddc 1S 1W
15. J. V. Chandler 3/1/48 GR-2199 GR-2104 35 gpm 4.0 10.00 1971.21 Ind. 10acb 2S W
16. Armand John DeRosset Jr. 1948 GR-894 GR-869
Estate 8 gpm 10.0 25.00 1996.21 Irr. 28dda 1S
17. M. W. Webber 1948 GR-3123 GR-2930 10 gpm 5.0 12.50 2008.71 Irr. lccd 2S 2W .
18. Jack L. Barron 4/49 GR-2465 GR-2335 14 gpm 1.0 2.50 2011.21 Irr. 20cbc 1S 1W
19. Glen Brisbine 8/49 GR-3812 GR-3474 5 gpm 2.0 5.00 2016.21 Irr. 30abb 1S 1W
20. Reuben and Joyce Sandness 1949 GR-2636 GR-3997 16 gpm 1.0 2.50 2018.71 Irr. 4bdb 2S 1W
Use of Water: Irr. , Irrigation; Ind. , Industrial; Mun. , Municipal.
Well Location: by Section, Township and Range, see page
*: in acre feet of water
TABLE 3 (Continued)
Priority Appl. Permit Cert. Permitted Max. Cum.
No. Record Holder Date No. No. Well
No. Diversion Acreage Allow.* Rights* Use Location
21. Tigard Water District #2 1949 GR-615 GR-587
22. Lester Arnold Montgomery 3/1/50 GR-4053 GR-3653 500 gpm 806.38 2825.09 Mun. lObba 2S 1W
23. Orville L. and 6 gpm 3/4 ac. 1.88 2826.97 Irr. 31cca 1S 1W
4/50 GR-2954 GR-2772 440 gpm 75.8 189.50 3016.47 Irr. ldab 2S 2W
Hubert F. Bierly
24. C. V. Morrison 8/50 GR-3371 GR-3919 10 gpm 3.0 7.50 3023.97 Irr. 30adb 1S '•a
25. Lyle R. & Jane Miller 5/4/51 GR-4028 GR-3627 12 gpm 25.0 62.50 3086.47 Irr. 24dcb 1S ..,�
26. William Bodman Sanders & 8/27/51 GR-667 GR-1545 28 gpm 8.5 21.25 3107.72 Irr. 1Odba 2S 1W
Claire M. Sanders
27. Robert M. Stewart 10/51 GR-3837 GR-3497 42 gpm 4.0 10.00 3117.72 Irr. 21dba IS 1W
28. O. D. Walker & 10/5/51 GR-1460 GR-1409 35 gpm 3.0 '7.50 3125.22 Irr. 23aba 1S 2W
H. W. Shafer
29. Union High School #2 4/52 GR-2832 GR-2669 40 gpm 20.0 50.00 3175.22 Irr. 14abb 2S 1W
Washington County
30. Albert Rupprecht 5/52 GR-1551 GR-1495 50 gpm 20.8 52.00 3227.22 Irr. 22adb 1S 2W
31. Edward Roshak 10/52 GR-366 GR-352 70 gpm 50.0 125.00 3352.22 Irr. 6ddc 2S 1W
32. John & Joe Santoro 10/14/52 GR-333 GR-318 220 gpm 103.0 257.50 3609.72 Irr. 23cda 1S 2W
33. E. L. Hannabass 11/1/52 GR-2806 GR-2648 15 gpm 3.0 7.50 3617.22 Irr. 24aac 1S 2W
34. G. Palmer Brykit 11/6/52 GR-3005 GR-2814 12 gpm 3.0 7.50 3624.72 Irr. 19dda 1S 1W
35. Howard Wm. and 12/52 GR-132 GR-123 10 gpm 2.2 5.50 3630.22 Irr. llcba 2S 1W
Marilyn K. Boyte
36. George L. Penrose 2/1/53 GR-1555 GR-1499 64 gpm 10.0 25.00 3655.22 Irr. llabb 2S 1W
37. Walter H. and Approx. GR-131 GR-122 35 gpm 3.5 8.75 3663.97 Irr. llcbb 2S(
Hazel Pearl Engler 2/15/53
38. Torazo Hasuike and 8/8/53 GR-1880 GR-1819
200 gpm 45.0 112.50 3776.47 Irr. 17aba 2S 1W
James Hasuike
39. Henry L. Burns 9/53 GR-600 GR-569 15 gpm 3.0 7.50 3783. 7 Irr. 19cdc 1S 1W
135
40. E. J. & R. E. Lindquist 10/15/53 GR-1538 GR-1481 4gpm 7.0 17.50 3801.47 Irr. 6ccc 2S 1W
41. Robert Sunamoto 1953 GR-575 GR-548 250 gpm 57.0 142.50 3943.97 Irr. 4abc 2S 1W
42. School District #94 of 8/2/54 GR-4050 GR-3651
50 gpm 9.0 22.50 3966.47 Irr. 19ddb 1S 1W
Washington County
43. Arvin A. Burnett 9/15/54 GR-2789 GR-2636 12 gpm 0.57 1.43 3967.90 Irr. 19dbc 1S 1W
44. Julius Wedeking 4/55 GR-379 GR-365 80 gpm 15.0 37.50 4005.40 Irr. 12bac 2S 2W
45. Fred & Georgina Vedder 7/1/55 GR-2393 GR-2274
9 gpm 1.8 4.50 4009.90 Irr. 24ddd 1S 2W
TABLE 3 (Continued)
Priority Appl. Permit Cert. Permitted Max. Cum.
No. Record Holder Date No. No. Well
No. Diversion Acreage Allow.* Rights* Use Location
46. Edward, Henry and 2/7/57 G-563 G-488 30332 0.48 cfs 38.4 96.00 4105.90 Irr. 6ddc 2S 1W
Theodore Roshak
47. Carl Schaefer 3/29/57 G-591 G-499 28970 0.35 cfs 28.0 70.
48. Aloha-Huber Water 5/2/57 G-637 G-588 36440 1.1 cfs 00 4175.90 Irr. 26bdc 1S 2W
District #1 815.07 4990.97 Mun. 24dac 1S 2W
49. J. M. Harder 6/24/57 G-690 G-612 29661 0.03 cfs 3.4 8.50 4999.47 Irr. lOdda 2X_d
50. Tigard Water District #3 9/16/57 G-760 G-655 28971 0.78 cfs
51. Leonard S. Davis 3/58 GR-597 GR-567 577.96 5577.43 Mun. 4acc 2S 1W
60 gpm 12.0 30.00 5607.43 Irr. 3dcc 2S 1W
52. Karl Schaefer
3/26/58 G-904 G-798 28972 0.35 cfs 28.0 70.00 5677.43 Irr. 26bdc 1S 2W
53. Warren Northwest Inc. 7/31/58 G-1135 G-965 28491 0.11 cfs 26.56 66.40 5743.83 Ind. 26dcd 1S 2W
54. Aloha-Huber Water District 1/21/59 Transfer #2490 Sp. Or. 0.58 cfs
116.00 5859.83 Mun. 17cdb 1S 1W
vol. 22 p. 197
55. Schuepbach Brothers 1/21/59 Transfer #2490 Sp. Or. 0.73 cfs 58.0 145.00 6004.83 Irr. 17cdb 1S 1W
Vol. 22 p. 197
56. Frank Brooks 11/9/59 G-1617 G-1529 29666 0.04 cfs 5.1 12.75 6017.58 Irr. 4dcd 2S 2W
57. Mrs. Myron P. Dressler 7/12/60 G-1734 G-1612 32496 0.02 cfs 1.9 4.75 6022.33 Irr. llcba 2S 1W
58. Baker Rock Crushing Co. 11/9/61 G-2157 G-1985 33211 0.45 cfs 113.42 283.55 6305.88 Ind. 26acc 1S 2W
59. Aloha-Huber Water 2/23/62 G-2242 G-2064 36441 2.2 cfs 1630.15 7936.03 Mun. 23ddc 1S 2W
District #2
60. William B. and 4/30/62 G-2309 G-2170 32020 0.03 cfs 2.6 6.50 7942.53 Irr. lOdba 2S 1W
Claire M. Sanders
61. J. H. Aten 5/17/62 G-2325 G-2150 33116 0.23 cfs 25.0 62.50 8005.03 Irr. 12bcc 2S
62. Alfred B. Okerman 1/17/63 G-2530 G-2345 34729 0.03 cfs 2.3 5.75 8010.78 Irr. 35bba 1S 2W
63. Robert Sunamoto 2/28/63 G-2556 G-2367 35683 0.18 cfs 14.3 35.75 8046.53 Irr. 4abc 2S 1W
64. Lyle H. Cobb 6/25/63 G-2641 G-2485 34941 0.73 cfs 25.4 63.50 8110.03 Irr. 29aad 1S 1W
311.
65. Louis F. Hesse 7/17/63 G-2663 G-2469 34497 0.30 cfs 48.1 120.21 8421.24 Ind.
66. M. K. Terril 9/23/65 G-3240 G-3116 25 8541.49 Irr. 2dcb 2S 2W
67. Tigard Water District #4 11/19/65 G-3301 G-2999 0.01 cfs 4.0 10.00 8551.49 Irr. 16dbb 2S 1W
2.20 cfs 1630.15 10181.64 Mun. lOcbb 2S 1W
68. Robert John Elskamp 12/8/65 G-3315 G-3087
69. D. L. Watts 80 gpm 5.0 12.50 10194.14 Irr. 26bbc 1S 2W
2/8/66 G-3373 G-3177 0.62 cfs 49.56 123.90 10318.04 Irr. 28aab 1S 2W
120 gpm
70. Tigard Water District #1 4/25/66 G-3466 G-3270 1.67 cfs >ac+
��� 1237.43 11555.47 Mun. llbcb 2S 1W
TABLE 3 (Continued)
Priority Appl. Permit Cert. Permitted
No. Record Holder Date No, Max. Cum. Well
No. No. Diversion Acrea a Allow.*
Acreage Rights* Use Location
71. T. C. Wasson 5/26/66 G-3510 G-3304
72. Cyrene Elizabeth Hardie 9/12/66 G-3665 G-3441 34943 0.102 cfs gpm 4.5 11.25 11566.72 Irr. 15bdb 2S 1W
73. Fred Mathias 12/9/66 G-3752 G-3542 36444 0, 9.5 23.75 11590.47 Irr. 29dbd 1S 1W
74. Tualatin Development Co. 1/17/67 G-3777 G-3463 13 cfs 16.0 40.00 11630.47 Irr. 7acd 2S 1W
75. Lyle Cobb 0.54 cfs 43.38 108.45 11738.92 Irr. lOccb 2S 1W
1/31/67 G-3794 G-3576 36445 0.21 cfs 17.
76. Clifford E. Hawkinson 10/4/67 G-4100 G-3848 0 42.50 11781.42 Irr. 29aad 1S
77. Cooper Mountain Water 2/23/68 G-4248 G-4008 0.08 cfs 6.0 15.00 11796.42 Irr. 28adb 1S 21
District #1 0.22 cfs 163.01 11959.43 Mun. 31dab 1S 1W
78. Harry Werner 5/29/68 G-4422 G-4167
0.20 cfs 27.40 68.50 12027.93 Irr. 5bca 2S 1W
79. John Klotz & Anna Klotz 9/3/68 G-4379 G-4131
80. Charles or Katherine 5/29/70 G-5203 0.06 cfs 4.5 11.25 12039.18 Irr. 21dda 1S 1W
Starr 50 gpm 13.0 32.50 12071.68 Irr. 28abd 1S 2W
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