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HomeMy WebLinkAboutLindner Complex Reach Planning Area (Preliminary Concept Designs)                      !  !" ##  $!     !%&'!()!(* !$ )+,   '$-(* ,(.  #(   )    / '   $  ' ( 01  2 3-  4   0" ##  $   3-   0 567 &/8  76 &3- 9    : &;<= &;<= &;<=&;<= &;<= "=99='> $>? <@ ><&4= &;<= &;<= '<<=>91'& %<>   '<<=>9 1'& %<>   '<<=>91'& %<>   '<<=>9 1'& %<>   ?'9>='<'=;&$= >% A'&',  $,=$==B &',  ?=,&  =4 ?'9>='<'=;&$= ?'9>=' <'=;&$= <= <?=$> '=; $@ <= <?=$> '=; $@ <= <?=$> '=; $@ 9?&<%>1=''?,@$> 9?&<%>1=''?,@$> <= <?=$> '=; $@                    =:" ' ,>1>9&,=" =:&'<& % ,>%" =& 9>$= = < >44,= =:&'<& %>& < && <& & % , <& %$> &9= =,='= =9,=$<>" ' >>'=,=%=  :  ?'%' C    ,    0.    C 3 Includes conifer > 75-ft tall Air photo background collected March 2021 LiDAR hillshade 2013/14 Middle Lindner Complex Reach Upper Lindner Complex Reach Lower Lindner Complex Reach Lindner Complex Reach Overview PRIMARY PROPOSED ACTIONS 1.Opportunistically release young conifer throughout all alder-dominant floodplains •Increase light & growth rate to accelerate natural forest succession 2.Thin alder-dominant floodplain and plant with conifer •Convert alder-dominant floodplains to mixed to accelerate natural forest succession 3.Identify invasive species presence, treat and monitor •Eradicate existing invasive plants •Monitoring to identify and treat new occurrences 4.Install ELJs and/or reinforce existing logjams along floodplain margins to limit further lateral migration •Limit lateral migration of the main stem channel •Provide deep pools with cover in main stem or channel thread 5.Install ELJs and/or reinforce exiting logjams within the floodplain •further limit lateral migration and avulsion potential •Provide pools and cover along side channels within the floodplain 6.Install ELJs and/or reinforce exiting logjams in the main stem channel to split flow •Provide deep pools with cover in main stem or channel thread •Provide initiation point for forested islands to develop in lee PLANTING, RIPARIAN THINNING, CONIFER RELEASE LIKELY EXISTING HARD POINT EXISTING LOGJAM REINFORCEMENT Includes conifer > 75-ft tall                       ! !" ##  $!     !%&'!()!(* !$ )+,   '$-(* ,(.  #(   )    / '   $  ' ( 01  2 3-  4   0" ##  $   3-   0 567 &/8  76 &3- 9    : &;<= &;<= &;<=&;<= &;<= "=99='> $>? <@ ><&4= &;<= &;<= '<<=>91'& %<>   '<<=>9 1'& %<>   '<<=>91'& %<>   '<<=>9 1'& %<>   ?'9>='<'=;&$= >% A'&',  $,=$==B &',  ?=,&  =4 ?'9>='<'=;&$= ?'9>=' <'=;&$= <= <?=$> '=; $@ <= <?=$> '=; $@ <= <?=$> '=; $@ 9?&<%>1=''?,@$> 9?&<%>1=''?,@$> <= <?=$> '=; $@                    =:" ' ,>1>9&,=" =:&'<& % ,>%" =& 9>$= = < >44,= =:&'<& %>& < && <& & % , <& %$> &9= =,='= =9,=$<>" ' >>'=,=%=  :  ?'%' C    ,    0.    C 3 Includes conifer > 75-ft tall Air photo background collected March 2021 LiDAR hillshade 2013/14Middle Lindner Floodplain1, 2, 3, 5 1, 2, 3, 5 4 ELJs or complex timber revetment along floodplain margin to limit future CMZ widening ELJs or complex timber revetment along floodplain margin to limit future CMZ widening, cover any existing riprap with wood 4 6 66 4, 5 4, 5 2, 3, 6 Plant new deposits/surfaces as island develops over time 2021 FHWA Dolo ELJs Lower Lindner Complex Reach Concept Design PLANTING, RIPARIAN THINNING, CONIFER RELEASE LIKELY EXISTING HARD POINT EXISTING LOGJAM REINFORCEMENT Includes conifer > 75-ft tall                       ! !" ##  $!     !%&'!()!(* !$ )+,   '$-(* ,(.  #(   )    / '   $  ' ( 01  2 3-  4   0" ##  $   3-   0 567 &/8  76 &3- 9    : &;<= &;<= &;<=&;<= &;<= "=99='> $>? <@ ><&4= &;<= &;<= '<<=>91'& %<>   '<<=>9 1'& %<>   '<<=>91'& %<>   '<<=>9 1'& %<>   ?'9>='<'=;&$= >% A'&',  $,=$==B &',  ?=,&  =4 ?'9>='<'=;&$= ?'9>=' <'=;&$= <= <?=$> '=; $@ <= <?=$> '=; $@ <= <?=$> '=; $@ 9?&<%>1=''?,@$> 9?&<%>1=''?,@$> <= <?=$> '=; $@                    =:" ' ,>1>9&,=" =:&'<& % ,>%" =& 9>$= = < >44,= =:&'<& %>& < && <& & % , <& %$> &9= =,='= =9,=$<>" ' >>'=,=%=  :  ?'%' C    ,    0.    C 3 Includes conifer > 75-ft tall Air photo background collected March 2021 LiDAR hillshade 2013/14 PRIMARY PROPOSED ACTIONS 1.Opportunistically release young conifer throughout all alder-dominant floodplains •Increase light & growth rate to accelerate natural forest succession 2.Thin alder-dominant floodplain and plant with conifer •Convert alder-dominant floodplains to mixed to accelerate natural forest succession 3.Identify invasive species presence, treat and monitor •Eradicate existing invasive plants •Monitoring to identify and treat new occurrences 4.Install ELJs and/or reinforce existing logjams along floodplain margins to limit further lateral migration •Limit lateral migration of the main stem channel •Provide deep pools with cover in main stem or channel thread 5.Install ELJs and/or reinforce exiting logjams within the floodplain •further limit lateral migration and avulsion potential •Provide pools and cover along side channels within the floodplain 6.Install ELJs and/or reinforce exiting logjams in the main stem channel to split flow •Provide deep pools with cover in main stem or channel thread •Provide initiation point for forested islands to develop in lee Hoh River Roughen existing side channel to encourage more flow into enlarged side channel to south Relocate Public Works Facilities, remove existing infrastructure, rebuild floodplain and plant             4 4 4, 5 1, 2, 3, 5 1, 2, 3, 5 6 6 ELJs along floodplain margin to roughen slope toe and limit channel occupancy 4, 6 4, 6 6 66 1, 2, 3, 5Lower Lindner FloodplainUpper Lindner Floodpla in ELJs or complex timber revetment along floodplain margin to limit future CMZ widening Middle Lindner Complex Reach Concept Design PLANTING, RIPARIAN THINNING, CONIFER RELEASE LIKELY EXISTING HARD POINT EXISTING LOGJAM REINFORCEMENT Includes conifer > 75-ft tall                       ! !" ##  $!     !%&'!()!(* !$ )+,   '$-(* ,(.  #(   )    / '   $  ' ( 01  2 3-  4   0" ##  $   3-   0 567 &/8  76 &3- 9    : &;<= &;<= &;<=&;<= &;<= "=99='> $>? <@ ><&4= &;<= &;<= '<<=>91'& %<>   '<<=>91'& %<>   '<<=>9 1'& %<>   '<<=>9 1'& %<>   ?'9>='<'=;&$= >% A'&',  $,=$==B &',  ?=,&  =4 ?'9>='<'=;&$= ?'9>=' <'=;&$= <= <?=$> '=; $@ <= <?=$> '=; $@ <= <?=$> '=; $@ 9?&<%>1=''?,@$> 9?&<%>1=''?,@$> <= <?=$> '=; $@                    =:" ' ,>1>9&,=" =:&'<& % ,>%" =& 9>$= = < >44,= =:&'<& %>& < && <& & % , <& %$> &9= =,='= =9,=$<>" ' >>'=,=%=  :  ?'%' C    ,    0.    C 3 Includes conifer > 75-ft tall 1, 2, 3, 5 4 1, 2, 3, 5 1, 2, 3 4 4, 5 2, 3, 6 6 6 Plant new deposits/surfaces as island develops over time 6 1, 2, 3, 5 1, 2, 34 4, 5 ELJs or complex timber revetment along floodplain margin to limit future CMZ widening Hoh River Air photo background collected March 2021 LiDAR hillshade 2013/14 4, 5 PRIMARY PROPOSED ACTIONS 1.Opportunistically release young conifer throughout all alder-dominant floodplains •Increase light & growth rate to accelerate natural forest succession 2.Thin alder-dominant floodplain and plant with conifer •Convert alder-dominant floodplains to mixed to accelerate natural forest succession 3.Identify invasive species presence, treat and monitor •Eradicate existing invasive plants •Monitoring to identify and treat new occurrences 4.Install ELJs and/or reinforce existing logjams along floodplain margins to limit further lateral migration •Limit lateral migration of the main stem channel •Provide deep pools with cover in main stem or channel thread 5.Install ELJs and/or reinforce exiting logjams within the floodplain •further limit lateral migration and avulsion potential •Provide pools and cover along side channels within the floodplain 6.Install ELJs and/or reinforce exiting logjams in the main stem channel to split flow •Provide deep pools with cover in main stem or channel thread •Provide initiation point for forested islands to develop in lee Middle Lindner FloodplainRoughen existing side channel to encourage more flow into enlarged side channel to south Enlarge side channel inlet to encourage more flow Upper Lindner Complex Reach Concept Design