Existing Conditions continued

• flows from its largely rural upper watershed to the City of Issaquah’s urban core in its lower reaches. Rapid residential growth in the basin means flooding SAMMAMISH now significantly affects parts of downtown. Flood risk reduction consists mostly of hardened banks within the city and acquisition of frequently flooded properties. RIVER AND • Issaquah Creek is a significant resource for both native and hatchery ; lands acquired to mitigate floods also provide important habitat protection and restoration opportunities. ISSAQUAH CREEK

King County Flood Plan accomplishments 2006-2012: King County Flood Hazard • Enhanced recreational, aesthetic and habitat values along the with a series of riverbank restorations, replacing invasive plants with Northwest native species Management Plan Update in partnership with the cities of Redmond, Woodinville, Bothell and Kenmore. Restored banks on the Sammamish River • Improved habitat and recreation consistent with flood conveyance goals through in Redmond, 2010 city projects that have added wood in the river, native plants along the river and re-contoured banks. King County’s river and floodplain management vision and strategy: • Increased the frequency and extent of vegetation maintenance in the Transition Zone • Maintain the Sammamish River channel, banks, and weir to convey floodwaters consistent with the between and the Sammamish River to make sure the lake drains as 1964 U.S. Army Corps of Engineers maintenance plan while improving conditions for fish and wildlife. intended during high water conditions. Lake levels for 2012 have improved markedly after maintenance in 2011. • Cooperate with the U.S. Army Corps of Engineers and the cities of Kenmore, Redmond, Woodinville and Bothell to remove invasive plants and set banks back to accommodate flows and establish native plants • The City of Issaquah acquired parcels, elevated buildings, set back levees and stabilized along the river. banks to reduce flood risks. Projects included an acquisition and partial levee removal in the Sycamore neighborhood in 2010. Overall, the city has preserved 100 acres of • Improve habitat by restoring tributary connections, creating overhanging shade and cover from floodplain as permanent open space. riverside plants, and increasing the amount of large wood in the river, while maintaining a commitment to flood conveyance. Proposed river and floodplain management actions for 2013-2018: • Improve the Transition Zone between Lake Sammamish and the Sammamish River to address flood concerns in the lake and improve fish and wildlife habitat consistent with Endangered Species Act • Reconfigure the outflow from Lake Sammamish into the river, as part of the Willowmoor recovery efforts. Floodplain Restoration Project, to maintain or reduce flood risk in a way that reduces impacts on fish and wildlife in the transition zone and supports recovery of endangered • Reduce risks to flood-prone homes and commercial buildings near Issaquah Creek through buyouts, species, particularly fish migrating upstream through the weir into structural improvements and setting back levees. Lake Sammamish and Issaquah Creek. • Prevent new at-risk development, especially along Issaquah Creek, through land use policies and • Continue Sammamish Riverbank restoration with the U.S. Army Corps of Engineers targeted acquisitions. and the cities of Redmond, Woodinville, Bothell and Kenmore to take advantage of opportunities to improve connections with tributary streams, re-contour and set back Existing conditions of the riverbanks and do native plantings. We will work with the U.S. Army Corps of Engineers Sammamish River/Issaquah Creek: to maintain the Sammamish River consistent with the 1964 plan and the endangered species listing for native salmon. • The Sammamish River is a relatively flat, channelized and straightened river connecting • Acquire, elevate and redevelops at-risk structures to reduce flood risks with the Lake and Lake Sammamish. City of Issaquah, and acquire undeveloped property in known flood hazard areas to prevent new at-risk construction. • Farmland, regional parks, and the well-used line the river through its central valley. The core of the cities, homes, parks, light industry and businesses lie near the river. • Rare floods bring minor overtopping of agricultural and recreational lands in the valley and docks and lawns overtop on Lake Sammamish. Flooding Residential flooding in the City of Issaquah, 2009 Questions? Please call 206-296-8001 Translation services and presents few threats to public safety. or email [email protected]. alternate formats available continued on back

Printed on recycled paper. Please recycle. Call 206-296-6519 or TTY:711 File: 1211_2797sammamISS.indd wgab Existing Conditions continued

• Issaquah Creek flows from its largely rural upper watershed to the City of Issaquah’s urban core in its lower reaches. Rapid residential growth in the basin means flooding SAMMAMISH now significantly affects parts of downtown. Flood risk reduction consists mostly of hardened banks within the city and acquisition of frequently flooded properties. RIVER AND • Issaquah Creek is a significant resource for both native and hatchery salmon; lands acquired to mitigate floods also provide important habitat protection and restoration opportunities. ISSAQUAH CREEK

King County Flood Plan accomplishments 2006-2012: King County Flood Hazard • Enhanced recreational, aesthetic and habitat values along the Sammamish River with a series of riverbank restorations, replacing invasive plants with Northwest native species Management Plan Update in partnership with the cities of Redmond, Woodinville, Bothell and Kenmore. Restored banks on the Sammamish River • Improved habitat and recreation consistent with flood conveyance goals through in Redmond, 2010 city projects that have added wood in the river, native plants along the river and re-contoured banks. King County’s river and floodplain management vision and strategy: • Increased the frequency and extent of vegetation maintenance in the Transition Zone • Maintain the Sammamish River channel, banks, and weir to convey floodwaters consistent with the between Lake Sammamish and the Sammamish River to make sure the lake drains as 1964 U.S. Army Corps of Engineers maintenance plan while improving conditions for fish and wildlife. intended during high water conditions. Lake levels for 2012 have improved markedly after maintenance in 2011. • Cooperate with the U.S. Army Corps of Engineers and the cities of Kenmore, Redmond, Woodinville and Bothell to remove invasive plants and set banks back to accommodate flows and establish native plants • The City of Issaquah acquired parcels, elevated buildings, set back levees and stabilized along the river. banks to reduce flood risks. Projects included an acquisition and partial levee removal in the Sycamore neighborhood in 2010. Overall, the city has preserved 100 acres of • Improve habitat by restoring tributary connections, creating overhanging shade and cover from floodplain as permanent open space. riverside plants, and increasing the amount of large wood in the river, while maintaining a commitment to flood conveyance. Proposed river and floodplain management actions for 2013-2018: • Improve the Transition Zone between Lake Sammamish and the Sammamish River to address flood concerns in the lake and improve fish and wildlife habitat consistent with Endangered Species Act • Reconfigure the outflow from Lake Sammamish into the river, as part of the Willowmoor recovery efforts. Floodplain Restoration Project, to maintain or reduce flood risk in a way that reduces impacts on fish and wildlife in the transition zone and supports recovery of endangered • Reduce risks to flood-prone homes and commercial buildings near Issaquah Creek through buyouts, species, particularly fish migrating upstream through the weir into structural improvements and setting back levees. Lake Sammamish and Issaquah Creek. • Prevent new at-risk development, especially along Issaquah Creek, through land use policies and • Continue Sammamish Riverbank restoration with the U.S. Army Corps of Engineers targeted acquisitions. and the cities of Redmond, Woodinville, Bothell and Kenmore to take advantage of opportunities to improve connections with tributary streams, re-contour and set back Existing conditions of the riverbanks and do native plantings. We will work with the U.S. Army Corps of Engineers Sammamish River/Issaquah Creek: to maintain the Sammamish River consistent with the 1964 plan and the endangered species listing for native salmon. • The Sammamish River is a relatively flat, channelized and straightened river connecting • Acquire, elevate and redevelops at-risk structures to reduce flood risks with the and Lake Sammamish. City of Issaquah, and acquire undeveloped property in known flood hazard areas to prevent new at-risk construction. • Farmland, regional parks, and the well-used Sammamish River Trail line the river through its central valley. The core of the cities, homes, parks, light industry and businesses lie near the river. • Rare floods bring minor overtopping of agricultural and recreational lands in the valley and docks and lawns overtop on Lake Sammamish. Flooding Residential flooding in the City of Issaquah, 2009 Questions? Please call 206-296-8001 Translation services and presents few threats to public safety. or email [email protected]. alternate formats available continued on back

Printed on recycled paper. Please recycle. Call 206-296-6519 or TTY:711 File: 1211_2797sammamISS.indd wgab BOTHELL SNOHOMISH COUNTY L SHORELINE M y LAKE BASINWIDE PROJECTS o c n KING COUNTY SAMMAMISH A FOREST l C · Priority Acquisitions e PARK e re r ek 522 WOODINVILLE C Bothell Wy NE Lake re NOT PICTURED ek 4 Sammamish McAleer- · Issaquah Creek Lyon 2 Repetitive Loss Properties 6

4

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8 m a KIRKLAND 12121600 u a q a m ss 2 I m rk

a o F S 2 rth No USGS Gauge NE 124th St 5 12125200 REDMOND 2 4 405 10 2

k Hatchery 90 e e NE 90th St r 4 C

SEATTLE s tt e ISSAQUAH 6 b n b o i t 12 T g in h s KC Gauge 4 a 51M W e YARROW 6 I k s a s POINT a

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L 10 SAMMAMISH BEAUX 18 ARTS 90 12 4 MERCER Lower Coal Creek USGS Gage ISLAND Flood Hazard Reduction 12120600

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a k BASINWIDE PROJECT l e e C r 405 2 · Sammamish Bank Restoration re C ek r 6 de ISSAQUAH ol ADDITIONAL GAUGES H 2 · There are additional USGS gauges not NEWCASTLE pictured here with short periods of C 4 ar record as well as some temporary ey Cree King County gauges installed in the k Transition Zone.

NOT PICTURED TUKWILA RENTON · Sammamish River Repetitive Loss MitigationBURIEN

N Map 5-9 N Map 5-10 SAMMAMISH RIVER AND LAKE WASHINGTON CREEKS ISSAQUAH CREEK KING COUNTY FLOOD HAZARD MANAGEMENT PLAN 0 1 2 Miles 0 1 2 Miles KING COUNTY FLOOD HAZARD MANAGEMENT PLAN

Proposed Project Sites, as (WRIA Salmon Recovery described in Chapter 5 3-Year Work Plan Project Sites Rivers and Streams with FEMA 2 River Miles (Approximate) (Project locations are approximate) and Reaches Mapped 100-Year Regulatory Floodplains Watershed/Basin Boundary Proposed Project Reach Flood Protection Infrastructure Department of Road Department of (Levees & Revetments) Natural Resources and Parks Rivers and Streams with Natural Resources and Parks Rivers and Streams with FEMA Water and Land Resources Division Unmapped Regulatory Floodplains Water and Land Resources Division Mapped 100-Year Regulatory 2 River Miles (Approximate) Incorporated Area The information included on this map has been compiled from a variety of sources Flood Protection Infrastructure The information included on this map has been compiled from a variety of sources Floodplains and is subject to change without notice. King County makes no representations or and is subject to change without notice. King County makes no representations or Road warranties, express or implied, as to accuracy, completeness, timeliness, or rights (Levees & Revetments) warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall not be liable for any general, to the use of such information. King County shall not be liable for any general, Rivers and Streams with special, indirect, incidental, or consequential damages including, but not limited to, special, indirect, incidental, or consequential damages including, but not limited to, Incorporated Area lost revenues or lost profits resulting from the use or misuse of the information lost revenues or lost profits resulting from the use or misuse of the information Unmapped Regulatory Floodplains contained on this map. Any sale of this map or information on this map is WRIA Salmon Recovery contained on this map. Any sale of this map or information on this map is prohibited except by written permission of King County. 3-Year Work Plan Project Sites prohibited except by written permission of King County. Data sources: King County datasets and Reaches Data sources: King County datasets File name: 1211_2636fhmp59SAMM.ai wgab File name: 1206_2636fhmp510ISSAQUAH.ai wgab BOTHELL SNOHOMISH COUNTY L SHORELINE M y LAKE BASINWIDE PROJECTS o c n KING COUNTY SAMMAMISH A FOREST l C · Priority Acquisitions e PARK e re r ek 522 WOODINVILLE C Bothell Wy NE Lake re NOT PICTURED ek 4 Sammamish McAleer- · Issaquah Creek Lyon 2 Repetitive Loss Properties 6

4

r

KENMORE e

v

i

k

R e

e

NE 145th St r h

C

s i USGS Gage h

8 m a KIRKLAND 12121600 u a q a m ss 2 I m rk

a o F S 2 rth No USGS Gauge NE 124th St 5 12125200 REDMOND 2 4 405 10 2

k Hatchery 90 e e NE 90th St r 4 C

SEATTLE s tt e ISSAQUAH 6 b n b o i t 12 T g in h s KC Gauge 4 a 51M W e YARROW 6 I k s a s POINT a

L q

HUNTS Willowmoor u

520 Floodplain a POINT h

Restoration

C r

e 4

e CLYDE k SEATTLE HILL h 8 s 2 MEDINA BELLEVUE i m M a cD 6 m on ek al 2 re m d C C a reek e S il e Fifteenm k

a

L 10 SAMMAMISH BEAUX 18 ARTS 90 12 4 MERCER Lower Coal Creek USGS Gage ISLAND Flood Hazard Reduction 12120600

C o

a k BASINWIDE PROJECT l e e C r 405 2 · Sammamish Bank Restoration re C ek r 6 de ISSAQUAH ol ADDITIONAL GAUGES H 2 · There are additional USGS gauges not NEWCASTLE pictured here with short periods of C 4 ar record as well as some temporary ey Cree King County gauges installed in the k Transition Zone.

NOT PICTURED TUKWILA RENTON · Sammamish River Repetitive Loss MitigationBURIEN

N Map 5-9 N Map 5-10 SAMMAMISH RIVER AND LAKE WASHINGTON CREEKS ISSAQUAH CREEK KING COUNTY FLOOD HAZARD MANAGEMENT PLAN 0 1 2 Miles 0 1 2 Miles KING COUNTY FLOOD HAZARD MANAGEMENT PLAN

Proposed Project Sites, as (WRIA Salmon Recovery described in Chapter 5 3-Year Work Plan Project Sites Rivers and Streams with FEMA 2 River Miles (Approximate) (Project locations are approximate) and Reaches Mapped 100-Year Regulatory Floodplains Watershed/Basin Boundary Proposed Project Reach Flood Protection Infrastructure Department of Road Department of (Levees & Revetments) Natural Resources and Parks Rivers and Streams with Natural Resources and Parks Rivers and Streams with FEMA Water and Land Resources Division Unmapped Regulatory Floodplains Water and Land Resources Division Mapped 100-Year Regulatory 2 River Miles (Approximate) Incorporated Area The information included on this map has been compiled from a variety of sources Flood Protection Infrastructure The information included on this map has been compiled from a variety of sources Floodplains and is subject to change without notice. King County makes no representations or and is subject to change without notice. King County makes no representations or Road warranties, express or implied, as to accuracy, completeness, timeliness, or rights (Levees & Revetments) warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall not be liable for any general, to the use of such information. King County shall not be liable for any general, Rivers and Streams with special, indirect, incidental, or consequential damages including, but not limited to, special, indirect, incidental, or consequential damages including, but not limited to, Incorporated Area lost revenues or lost profits resulting from the use or misuse of the information lost revenues or lost profits resulting from the use or misuse of the information Unmapped Regulatory Floodplains contained on this map. Any sale of this map or information on this map is WRIA Salmon Recovery contained on this map. Any sale of this map or information on this map is prohibited except by written permission of King County. 3-Year Work Plan Project Sites prohibited except by written permission of King County. Data sources: King County datasets and Reaches Data sources: King County datasets File name: 1211_2636fhmp59SAMM.ai wgab File name: 1206_2636fhmp510ISSAQUAH.ai wgab