Lake_Youngs_Perimeter_Drains_with_Sections_Highlighted.pdf
PDF 201 KB Posted
- Attached to
- Outreach Event: Cascades Dam Tour
- Solicitation number
- Outreach Event10222026
- Issued by
- King County, Spokane City, Washington
About this file
This is a technical drainage infrastructure map prepared by the City of Seattle depicting the perimeter drain system for Lake Youngs, a water reservoir facility located in unincorporated King County, Washington. The map illustrates the comprehensive drainage network surrounding the Lake Youngs Reservoir, including 37 numbered manholes (MH 1 through MH 37), four outfalls (A, B, C, and D), and approximately 26,000 linear feet of drain lines constructed from vitrified clay pipe (VCP) and concrete materials. The drain lines vary in diameter from 8 inches to 24 inches, with the majority consisting of 18-inch pipe. A Cured-in-Place Pipe (CIPP) section is identified on the map, indicating a previously rehabilitated drainage segment. The map uses 5-foot contours to show the topography surrounding the reservoir and identifies water lines, roads, and structures relevant to the drainage infrastructure.
The map was created on May 11, 2023, using State Plane coordinates (NAD83-91, Washington North Zone) and is associated with an upcoming outreach event—a Cascades Dam Tour scheduled for October 22, 2026—during which Seattle Public Utilities will discuss two upcoming consultant contracting opportunities, including the Lake Youngs Perimeter Drain Lining project. This technical document serves as the basis for understanding the scope and extent of the aging drainage infrastructure that will require design and potentially rehabilitation work as part of the referenced consulting contracts.
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Text version
525500
600575
550 575
575 550
Lake Youngs ± !! Manholes
Concrete Drain Lines
Vitrified Clay Drain Lines
Water Lines
5 Ft Contours
Roads
Structures
Perimeter Drains
©2014, THE CITY OF SEATTLE, all rights reserved.
No warranties of any sort, including accuracy, fitness or merchantability, accompany this product. Coordinate System: State Plane, NAD83-91, Washington North Zone
1,000
Feet tillys T:\UTIL_Mntnce\Products and Services\Data Provision\Water\10786_Lake_Youngs_Drainage_Map\10786_LakeYoungsPerimeterDrains.mxd
5/11/2023
MH 1
MH 2
MH 3
MH 4
MH 5
OUTFALL
"A"
OUTFALL
"D"
MH 6
MH 7
MH 8
MH 9
MH 10
MH 11
MH 12
MH 13
MH 14
MH 15MH 16MH 17
MH 18
MH 19
MH 20
MH 21
MH 22
MH 23
MH 24A
MH 24
MH 25
MH 26
MH 26A
MH 27
OUTFALL
"B"
OUTFALL
"C"
MH 29
MH 30
MH 31
MH 32
MH 35
MH 33
Lake Youngs
18" 379'
18" 690'
18" 615'
18" 1021'
18" 700'
18" 534'
18" 588'
18" 562'
18" 601'
18" 839'
18" 590'
18" 211'
18" 906'
18" 509'
18" 699'
8" 570'
12" 1186'
18"
568' VC
142' CONC
18" 970'
18" 331' 24" 390'
8" 394'
8" 451'
24" 1319'
24" 916'
24" 478'
24" 333'
24" 1145'
12" 656'
12" 1225'
18" 546'
18" 791'
18" 996'
18" 1100'
18" 796'
18" 225'
MH 23A
MH 34
MH 37
MH 36
18" 78'
18"
100' TO
INLET
18" 290'
18"
600' TO MH 38
18" 646'
18" 250'
EricksW PolyLine
EricksW PolyLine
EricksW Text Box
CIPP SECTION
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
EricksW PolyLine
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