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Camnreblenisive Alan Caasila] M aniagemenI Element Management Distrial mairlternancia acacesa foil water caor.ltrol structurcls within the Ulppeul St. Johrls Riueul Basin. C i fford E tacitI Rload Giiffcard Doak Road its 111e1 portion of Nortli G:iffbrd Road (45th) Strecat) locaat(ld east of U.S. 1. The Ccaunty's sucmlic and Ystoria roads ane dcpictcld :in Figuricl MI. Estuarine Watear Quality) Magoon wal ers within the county are designated byl the State as "Class III" from approxim atellyl Grand Harbor south tca an eastwcl.d linea inteYsecling the) nlorthernmosl tip cif lRound Island, and along thea western sido of the Intracoastal Waterway) (IICW) fiom th() )Mabas:lo Causaway r.lcarth to the ncarth clounty line. "Class 11" waiters ext chid from the) north county line south to the) Wabasso caausewaM east of the ICW, fiom the Wabasso aauseawaaM south tca thea northearrl llimil of the Grand Harbor dem6capmenit, and from an east west line int enlseactrinlg the nortf.I= tip of Round Island south to the south) county line. TT e ,iudaace water cl assi fi cations arae shown) in F igurp 9.1 R Within the Indian Rider Lagoon, one in 10 acnles (i.ea., 10°A) of Itho bcattom pis covierad in muck). Mucid is ha n lful to the Indian Riveul Lagoon syptem i bcacaause it defllel ea I He water of oxMgen and "b] ankets" th el bottcam, making it hard foil aquatic) vagelatiorl tca grow. A ccardini g to a 2002 update of thcl Indian Rimer Lagoon Surface Wal ar Improvlem iemlt and M anage mac Ir It Plan (SWIM), submerged aquatic vagelationl cawnlage incraaaad by MON in lhle awnlall laagocan from 1996 to 1 S 9SI. During that timer, auibmergad aquatic uegelation ucavculage :inculeased within IR16-20, or tYea aenatral portion) of lhle lagoon) naar the cut}{ of Vera BeacK That stiction) of 111a lagoon) h'stcaricalllyl displayed low acavculag(ls oflsubmergad aquat:icl viagetaation dua to inhculenit low watcul quality. Irl Iffil, the Sebastian Inlcat I listricl c ridged a dclep-waltur channel aonnlecling thle Sebastian Inlet to th e Ir.ldian Rivlenl Magoon) Intraaoalstall WattmwaA 1RCW). Prior) to that chlannel, senlaitiuel scaagrassas on sliallow shloalls along thle in;lide aflthcl :inlet wcule subject to damaaEla frcaml boat traffic. TTasa seaagraas areas ane now cd earl 31 markcld, and boat traffl c going tca and frcam Ole in] eat is direcatcad around thascl awas. Irl addition tca the) prlotecat:ion of sea grass, thea deep c11.1annel filc:ilitates a mcarea rapid flushing of the lagcaan with saawater. Natu ral E i sasatear P lanning H urriiaanes Hurricanels are sevlclra waathclr conditions associated with warm -corse 1vollicaal cyplloncas. Cam unity E eivedapmEmt Mpar tmcint Indian Riwir Camnt3l ] E