Full ecoregional plan - Conservation Gateway

Table 5: Size 2 Watershed System Summary DescriptionsSize 2SystemsConnectivity toSize 3 System ordirect to oceanPhysical Descriptions1 ocean Low elevation, very low gradient rivers on glacial outwash till and coarse sandysediment over acidic granitic bedrock, significant portion of watershed may be tidaland brackish; numerous wetlands; chemistry acidic2 8(9), some ocean Low elevation watershed dominated by flats; low to very low gradient trunks andtribs; on thin till and acidic metasedimentary bedrock, some coarse sedimentoutwash; numerous wetlands; chemistry acidic3 9,10, some ocean Low elevation watershed dominated by flats and gentle slopes; low gradient riversmeandering over gentle slopes on till, acidic to intermediate granitic bedrock;chemistry acidic; some brackish4 ocean Low elevation watershed dominated by flats and gentle slopes; low gradient riversmeandering over gentle slopes on till, acidic sedimentary bedrock; chemistry acidic;brackish5 12 Low elevation watershed dominated by gentle slopes and flats;low gradient riversystem in central valley on till and coarse grained sediments over acidic sedimentarybedrock; small rivers joining directly to CT mainstem; large areas of fine grainedsediment in valley along CT mainstem; chemistry acidic6 10,11 Low elevation watershed dominated by gentle slopes and flats;low gradient riversystems with some moderate gradient tributaries as the elevation rises on valleymargins; till over acidic sedimentary to granitic metamorphic bedrock w/ someintermediate granitic;7 13 Moderate to low elevation watershed dominated by gentle slopes with somesideslopes/coves along with flats; low gradient trunks with moderate to high gradienttributaries in the "marble valley"; till over calcareous bedrock; chemistry calcareousneutral8 12 Moderate to low elevation watershed dominated by gentle slopes along with largeareas of flats and some sideslopes/coves; low gradient trunks and more moderategradient trunks along sideslopes and coves; till on acidic sedimentary and moderatelycalcareous bedrock; chemistry: calc/neutral9 12,13 Moderate elevation river systems over mainly gentle slopes with some area ofsideslopes and coves along with pervasive flats; low to moderate gradient trunks withmoderate to very high gradient tribs; till over acidic sed/metased and graniticbedrock; chemistry acidic10 15 Low to moderate elevation watershed dominated by sideslopes and coves with somegentle slopes and steep slopes; low to moderate gradient river trunks with moderateto high gradient tributaries; till over on acidic sedimentary bedrock with large areasof locally calcareous to moderately calcareous sediments;11 14 Moderate to low elevation watershed dominated by gentle slopes with substantialsideslopes and coves; acidic sedimentary/metasedimentary and acidic granitic till.Moderate gradient trunks with moderate to high gradient tribs12 17 Moderate to high elevation watershed dominated by sideslopes and coves withsubstantial steep slopes and gentle hills; high gradient headwaters flowing into lowergradient trunks; primarily acidic granitic, acidic sedimentary/ metasedimentary, andsome mafic/intermediate granitic till.13 17 Moderate to high or very high watershed dominated by sideslopes with substantialareas of steep slopes and gentle hills; high gradient headwaters flowing into lowergradient trunks; primarily acidic granitic till (with some areas of mafic/intermediategranitic till).14 19 High elevation watershed dominated by sideslopes; acidic sedimentary/metasedimentary till. Swath of mafic-intermediate granitic till across CT Lakes, withscattered wet/moist flats.REVISED 6/2003AQUA-RESULTS-16