{"id":26178,"date":"2026-06-22T12:51:17","date_gmt":"2026-06-22T10:51:17","guid":{"rendered":"https:\/\/www.ern.org\/?page_id=26178"},"modified":"2026-06-22T15:16:50","modified_gmt":"2026-06-22T13:16:50","slug":"effacement-eyrieux_amont07","status":"publish","type":"page","link":"https:\/\/www.ern.org\/fr\/effacement-eyrieux_amont07\/","title":{"rendered":"Effacements de seuils sur l&rsquo;Eyrieux, Saint-Agr\u00e8ve (07)"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-58n7gns-39d8ef494769e4f8822fa72a6ceb690d\">\n.flex_column.av-58n7gns-39d8ef494769e4f8822fa72a6ceb690d{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-58n7gns-39d8ef494769e4f8822fa72a6ceb690d av_one_full  avia-builder-el-0  el_before_av_one_half  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m5zfn2co-e82df3f88a7af87a477f4f5cab659f97\">\n#top .av-special-heading.av-m5zfn2co-e82df3f88a7af87a477f4f5cab659f97{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-m5zfn2co-e82df3f88a7af87a477f4f5cab659f97 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-m5zfn2co-e82df3f88a7af87a477f4f5cab659f97 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-m5zfn2co-e82df3f88a7af87a477f4f5cab659f97 av-special-heading-h2 blockquote modern-quote  avia-builder-el-1  avia-builder-el-no-sibling '><h2 class='av-special-heading-tag '  itemprop=\"headline\"  >Effacement de deux seuils et renaturation de l\u2019Eyrieux Amont<\/h2><div class='av-subheading av-subheading_below'><p>Effacement du seuil de la Colonie et du seuil du Moulin du Pont sur l&rsquo;Eyrieux (Bassin versant du Rh\u00f4ne), Ard\u00e8che, France, 2025<\/p>\n<\/div><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-gr8tw8-c5a96c0afdd51ebc605d47ac0d7f28e0\">\n.flex_column.av-gr8tw8-c5a96c0afdd51ebc605d47ac0d7f28e0{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-gr8tw8-c5a96c0afdd51ebc605d47ac0d7f28e0 av_one_half  avia-builder-el-2  el_after_av_one_full  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-m5zg0qyo-a776e091b6d3b1d81059bacd1dcb0b92 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>Le PROJET<\/h3>\n<p>La vall\u00e9e de l\u2019Eyrieux est un territoire de contrastes, de sa source \u00e0 1\u00a0105 m d\u2019altitude \u00e0 sa confluence avec le fleuve Rh\u00f4ne \u00e0 93 m, au Sud de Valence.<\/p>\n<p>L\u2019Eyrieux amont est caract\u00e9ristique d\u2019une zone salmonicole de bonne qualit\u00e9, dont la truite fario est l\u2019esp\u00e8ce cible. L\u2019\u00e9crevisse \u00e0 pieds blancs (Austropotamobius pallipes) est \u00e9galement r\u00e9pertori\u00e9e autour du projet, le bassin de l\u2019Eyrieux est l\u2019un des plus importants peuplements \u00e0 l\u2019\u00e9chelle nationale \u00e0 ce jour avec plus de 100 km de lin\u00e9aire occup\u00e9. D\u2019autres esp\u00e8ces patrimoniales\u00a0sont pr\u00e9sentes\u00a0: sonneurs \u00e0 ventre jaune, azur\u00e9 des mouill\u00e8res, triton alpestre, loutre, cordulie \u00e0 corps fin\u2026<\/p>\n<p>Deux seuils, distants d\u2019une centaine de m\u00e8tres, barrent l\u2019Eyrieux amont au droit de la commune de Saint Agr\u00e8ve. Ils avaient \u00e9t\u00e9 con\u00e7us pour alimenter des activit\u00e9s \u00ab\u00a0textile\u00a0\u00bb, un moulin, une scierie, mais \u00e0 ce jour, plus aucun usage n\u2019est attach\u00e9 \u00e0 ces deux prises d\u2019eau.<\/p>\n<p>Les travaux vont consister \u00e0 supprimer les 2 seuils et \u00e0 recr\u00e9er les 70 m lin\u00e9aire de l\u2019Eyrieux dans son emplacement naturel en fond de vallon, sur la partie qui avait \u00e9t\u00e9 d\u00e9tourn\u00e9e. Ils contribueront ainsi \u00e0 la restauration totale des fonctionnalit\u00e9s des milieux aquatiques pr\u00e9sents sur ce secteur de l\u2019Eyrieux amont. En particulier, ils permettront la renaturation de sa morphologie, des habitats et des abords du cours d\u2019eau (ripisylve, espace de libert\u00e9\u2026).<\/p>\n<\/div><\/section><br \/>\n<div  class='avia-button-wrap av-m5zg1h56-e24d3b3fd7baacbd9c7eaddbaec7873a-wrap avia-button-center  avia-builder-el-4  el_after_av_textblock  el_before_av_hr '><a href='https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/factsheet_Eyrieux_ERN_mai2026.pdf'  class='avia-button av-m5zg1h56-e24d3b3fd7baacbd9c7eaddbaec7873a av-link-btn avia-icon_select-no avia-size-small avia-position-center avia-color-green'   aria-label=\"T\u00e9l\u00e9charger le factsheet, 4 pages qui r\u00e9sument le projet, en fran\u00e7ais, ERN, mai 2026\"><span class='avia_iconbox_title' >T\u00e9l\u00e9charger le factsheet, 4 pages qui r\u00e9sument le projet, en fran\u00e7ais, ERN, mai 2026<\/span><\/a><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ik52u0-328061fbe076144d4c20ff4708351684\">\n#top .hr.hr-invisible.av-ik52u0-328061fbe076144d4c20ff4708351684{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-ik52u0-328061fbe076144d4c20ff4708351684 hr-invisible  avia-builder-el-5  el_after_av_button  el_before_av_hr '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-fhn0yg-5312f69538ca5fe834a5fdda4b62e8ea\">\n#top .hr.hr-invisible.av-fhn0yg-5312f69538ca5fe834a5fdda4b62e8ea{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-fhn0yg-5312f69538ca5fe834a5fdda4b62e8ea hr-invisible  avia-builder-el-6  el_after_av_hr  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-m5zgox79-319fec83d08c0e77f2629b704af7a662 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>CONTEXTE ET OPPORTUNITE<\/h3>\n<p>L\u2019Eyrieux amont est class\u00e9 en Liste 1 au titre de l\u2019article L.214 17 du Code de l\u2019environnement. Ce tron\u00e7on, encore bien pr\u00e9serv\u00e9, pr\u00e9sente des enjeux forts pour la restauration des habitats d\u2019eaux vives, des zones humides et de la ripisylve.\u00a0Sur la commune de Saint Agr\u00e8ve, deux seuils rapproch\u00e9s bloquent la continuit\u00e9 de l\u2019Eyrieux. Anciens ouvrages li\u00e9s \u00e0 des activit\u00e9s textiles, ils sont aujourd\u2019hui sans usage. Le seuil de la Colonie d\u00e9rive les eaux de l\u2019Eyrieux dans un canal et ne comporte pas de dispositif qui permettent d\u2019assurer en tout temps un d\u00e9bit minimal dans le cours d\u2019eau. Le seuil du Moulin du Pont alimente un ancien moulin transform\u00e9 en habitation. Le cours de l\u2019Eyrieux y est enti\u00e8rement d\u00e9tourn\u00e9. Les propri\u00e9taires de se dernier site qui subissent d\u2019importantes infiltrations d\u2019eau dans le b\u00e2timent ont sollicit\u00e9 l\u2019association locale de p\u00eache pour trouver une solution et \u00e9loigner les eaux de leur moulin.<br \/>\nUne \u00e9tude men\u00e9e en 2020 par la F\u00e9d\u00e9ration D\u00e9partementale de P\u00eache de l\u2019Ard\u00e8che a permis d\u2019\u00e9valuer les options de restauration. En 2021, les propri\u00e9taires des seuils ont valid\u00e9 un sc\u00e9nario visant \u00e0 r\u00e9tablir le d\u00e9bit r\u00e9serv\u00e9, am\u00e9liorer la continuit\u00e9 \u00e9cologique et supprimer les infiltrations, en \u00e9change de l\u2019abandon de leur droit d\u2019eau.<br \/>\nLe projet est port\u00e9 par le Syndicat mixte de l\u2019Eyrieux \u00e0 Crussol, comp\u00e9tent en GEMA. Le financement provient de l\u2019Agence de l\u2019eau RMC, du D\u00e9partement de l\u2019Ard\u00e8che et de Open Rivers Programme.<br \/>\nL\u2019op\u00e9ration s\u2019inscrit dans le programme de mesures 2022 2027 du SDAGE Rh\u00f4ne M\u00e9diterran\u00e9e.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-61bs02-23a20bf59e4f3521753500d310c8fd04\">\n#top .hr.hr-invisible.av-61bs02-23a20bf59e4f3521753500d310c8fd04{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-61bs02-23a20bf59e4f3521753500d310c8fd04 hr-invisible  avia-builder-el-8  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-m5zfxeh8-c35df42547f5451a4246506148897f28 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>EN UN COUP D&rsquo;OEIL<\/h3>\n<ul>\n<li>Localisation : Ard\u00e8che (07), France<\/li>\n<li>La rivi\u00e8re : L&rsquo;Eyrieux<\/li>\n<li>Esp\u00e8ces cibles : Truite Fario, Ecrevisse \u00e0 pieds blancs<\/li>\n<li>Habitats cl\u00e9s : ripisylve, aulnaie \u00e0 fr\u00eanes, rivi\u00e8re \u00e0 Salmonidae<\/li>\n<li>Km \u00e0 ouvrir : 33 km de cours d\u2019eau principaux (amont et aval)<\/li>\n<li>Maitre d&rsquo;ouvrage <a href=\"https:\/\/www.eyrieux-crussol.fr\/\">SMEC\u00a0<\/a><\/li>\n<\/ul>\n<h3>T\u00e9l\u00e9charger<\/h3>\n<ul>\n<li><a href=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/factsheet_Eyrieux_ERN_mai2026.pdf\">Factsheet de ERN (mai 2026)<\/a><\/li>\n<li><a href=\"https:\/\/openrivers.eu\/projects\/202407604-removal-of-two-disused-weirs-in-the-eyrieux-river-basin-saint-agreve-france\/\">Open Rivers Programme webpage<\/a><\/li>\n<li><a href=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2024\/09\/2024-09-19_Communique-presse_projets_WorldRiverDay.pdf\">Communiqu\u00e9 de presse<\/a> du 22 septembre 2024<\/li>\n<\/ul>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-19z1blu-02d36556b8938038b62dec556f2aa91e\">\n#top .hr.hr-invisible.av-19z1blu-02d36556b8938038b62dec556f2aa91e{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-19z1blu-02d36556b8938038b62dec556f2aa91e hr-invisible  avia-builder-el-10  el_after_av_textblock  avia-builder-el-last '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2z8f26w-d4dcc969513d967f4adb8269681bc6af\">\n.flex_column.av-2z8f26w-d4dcc969513d967f4adb8269681bc6af{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-2z8f26w-d4dcc969513d967f4adb8269681bc6af av_one_half  avia-builder-el-11  el_after_av_one_half  el_before_av_one_half  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-mqp370qb-07ae945013d86ec9307f7addad510444 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>Seuil de la Colonie avant et apr\u00e8s travaux,<\/h3>\n<p>La forte pente du cours d&rsquo;eau, les r\u00e9seaux humides, le pont et les habitations aux abords ont fortement contraint les am\u00e9nagement post-travaux<\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-m5zg4uwr-23059f7a46f1ff5df553cbafcdc2de09 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div style=\"width: 2570px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/1-GENE1-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1324\" \/><p class=\"wp-caption-text\">Seuil de la Colonie avant travaux &#8211; CR SMEC<\/p><\/div>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-mqp2ma3b-bb24125e514e249d84a5183d455cbbec '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div style=\"width: 2358px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/colonie_apres_travaux4dec.jpg\" alt=\"\" width=\"2348\" height=\"1141\" \/><p class=\"wp-caption-text\">Seuil de la Colonie apr\u00e8s travaux &#8211; CR SMEC<\/p><\/div>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-nvqhqa-924e9a29dc1b6c071310ad6d9e3d9d47\">\n#top .hr.hr-invisible.av-nvqhqa-924e9a29dc1b6c071310ad6d9e3d9d47{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-nvqhqa-924e9a29dc1b6c071310ad6d9e3d9d47 hr-invisible  avia-builder-el-15  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-mqp3c5dt-44336d56de8eb17b44836a0879a8514e '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>Seuil du Moulin du Pont avant et apr\u00e8s travaux,<\/h3>\n<p>L&rsquo;Eyrieux a \u00e9t\u00e9 remis dans son lit historique et la continuit\u00e9 sur le ruisseau de Montrond r\u00e9tablie.<\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-mqp2ol49-373cd51dff5bc8a6e652c97282aa70b6 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div style=\"width: 2570px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/1b1_Seuil-du-Moulin-du-Pont_overflows-spillway_mediumflow-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1920\" \/><p class=\"wp-caption-text\">Seuil du Moulin du Pont, avant travaux, CR : SMEC<\/p><\/div>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-mqp2pb8p-424b750c443cbac046ce851d83d586d2 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div style=\"width: 323px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2026\/06\/20260424_155132-scaled.jpg\" alt=\"\" width=\"313\" height=\"679\" \/><p class=\"wp-caption-text\">Seuil du Moulin du Pont, apr\u00e8s travaux, reconnexion du ruisseau de Montrond, CR : ERN<\/p><\/div>\n<\/div><\/section><\/p><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-26v1xx4-708763b407f17665f13967efff18c538\">\n.flex_column.av-26v1xx4-708763b407f17665f13967efff18c538{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-26v1xx4-708763b407f17665f13967efff18c538 av_one_half  avia-builder-el-19  el_after_av_one_half  el_before_av_one_half  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-1jzplg8-493aeddc49b5ac38ba532a5c875d9280 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: right;\"><a href=\"https:\/\/www.ern.org\/fr\/effacement-du-barrage-de-kernansquillec\/\">Effacement pr\u00e9c\u00e9dent<\/a><br \/>\n<a href=\"https:\/\/www.ern.org\/fr\/effacement-du-barrage-de-kernansquillec\/\">&lt; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211;<\/a><\/p>\n<\/div><\/section><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1227fdk-14ce0eb81dc4d089024e5c8d36098db8\">\n.flex_column.av-1227fdk-14ce0eb81dc4d089024e5c8d36098db8{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-1227fdk-14ce0eb81dc4d089024e5c8d36098db8 av_one_half  avia-builder-el-21  el_after_av_one_half  avia-builder-el-last  flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-qdge60-797002b3cd7dbc305fcc19ba5b06dcde '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.ern.org\/fr\/effacement-poyat-sismae\/\">Effacement suivant<\/a><br \/>\n<a href=\"https:\/\/www.ern.org\/fr\/effacement-poyat-sismae\/\">&#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &#8211; &gt;<\/a><\/p>\n<\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-26178","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/pages\/26178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/comments?post=26178"}],"version-history":[{"count":15,"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/pages\/26178\/revisions"}],"predecessor-version":[{"id":26190,"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/pages\/26178\/revisions\/26190"}],"wp:attachment":[{"href":"https:\/\/www.ern.org\/fr\/wp-json\/wp\/v2\/media?parent=26178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}