Estrategias para la reducción de la mortalidad neonatal en Córdoba ...

control levees but were interconnected to other sloughs on the JBHNWR by drainage ditches.Construction in 2009 installed culverts and the new tide gate design at Hampson and WinterSloughs, replaced one of the three gates at Brooks Slough with the new tide gate design andfixed a heaved culvert at W201+30 that was thought to effect tide gate operation (Figure 1).JBHNWR includes islands that do not have dikes and that are adjacent to mainlandJBHNWR. The Hunting Islands are a group of three islands on the Washington side of theColumbia River immediately downstream of the town of Cathlamet at Rkm 54.7. The naturaltidal marsh habitat on South Hunting Island is relatively pristine with no evidence of humanhabitation or landscape alterations. The slough on the eastern edge of South Hunting Island wasselected as a control site (Figure 1). Price Island is also part of the JBHNWR. The island islocated on the Washington state side of the Columbia River at Rkm 56.3. Steamboat sloughseparates the Island from mainland JBHNWR on the Washington shore. The native tidal marshand tidal spruce swamp habitat remain intact with no apparent evidence of human settlement.There are no water control structures on the island. The large slough on the north (interior) sideof the island was selected as a control site on Price Island (Steamboat Slough) (Figure 1).