Procedure 51 Site Classifications

Rapid, qualitative biological and habitat surveys for wadeable streams and rivers are conducted using the Great Lakes Watersheds Assessment, Restoration, and Management (GLWARM) section Procedure 51. Procedure 51 consists of separate qualitative evaluations of the macroinvertebrate community, fish community, and habitat quality. These protocols can be used to assess the existing condition of Michigan's wadeable streams and rivers as well as detect spatial and temporal trends. This layer was developed to classify sites for the Water Resources Division Procedure 51 scoring process. The classifications were partly derived from EPA's StreamCat Dataset catchments and Level 3 Ecoregions, where ecoregion, catchment slope, and wetland composition, are components of the site class determination. The north region is comprised of catchments within level 3 Ecoregion 50: Northern Lakes and Forests and Ecoregion 51: North Central Hardwood Forests. Monitoring sites within the north region are classified according to stream width and percent coverage of wetland and open water land cover types according to the table below. North- Wetland > 40%: Stream Class Stream Width (ft.) Very Narrow < 13 Narrow 13 - 21.27 Wide OR Mid-Size Wet 21.27 - 68.367 Wide OR Mid-Size Wet > 68.367 North- Wetland < 40% Stream Class Stream Width (ft) Very Narrow < 13 Narrow 13 - 21.27 Mid-Size Dry 21.27 - 68.367 Wide OR Mid-Size Wet > 68.367 The south region is comprised of catchments with level 3 Ecoregion 55: Eastern Corn Belt Plains, Ecoregion 56: Southern Michigan/Northern Indiana Drift Plains and Ecoregion 57: Huron/Erie Lake Plains. Longitude -83.72 is used to divide the East classification from both WestFlat and WestSteep classifications. Please note that catchments whose boundaries intersected the north/south ecoregion boundary and the -83.72 longitude were split accordingly. These fragmented catchments retained their original % Wetland and % slope values from the StreamCat dataset for classification purposes . These values are not representative of the actual composition within those areas, they correspond to the original catchment boundaries. Learn more about EGLE Biological Assessments Questions about the data and P51 site classifications: Sarah Holden at [e-mail] Map feedback: [e-mail]本数据集采用大湖流域评估、恢复与管理（Great Lakes Watersheds Assessment, Restoration, and Management, GLWARM）规程51，开展可涉水溪流与河流的快速定性生物及生境调查。 规程51包含对大型无脊椎动物群落、鱼类群落及生境质量的独立定性评估。该套规程可用于评估密歇根州可涉水溪流与河流的现状，并探测其空间及时间变化趋势。 本图层旨在为密歇根州水资源部规程51的评分流程开展点位分类。该分类体系部分源自美国环境保护署（Environmental Protection Agency, EPA）StreamCat数据集的汇水区与三级生态区（Level 3 Ecoregions），其中生态区、汇水区坡度及湿地占比为点位类别判定的核心要素。 北部区域包含隶属于三级生态区50：北部湖泊与森林，以及生态区51：中北部硬木林的汇水区。北部区域的监测点位将依据溪流宽度、湿地及开阔水域土地覆盖类型的占比，按照如下规则分类： 湿地占比＞40%点位分类： 溪流类别 溪流宽度（英尺） 极窄 ＜13 窄型 13~21.27 宽型/中型湿生 21.27~68.367 宽型/中型湿生 ＞68.367 湿地占比＜40%点位分类： 溪流类别 溪流宽度（英尺） 极窄 ＜13 窄型 13~21.27 中型旱生 21.27~68.367 宽型/中型湿生 ＞68.367 南部区域包含隶属于三级生态区55：东部玉米带平原、生态区56：密歇根南部/印第安纳北部冰碛平原，以及生态区57：休伦/伊利湖平原的汇水区。以经度-83.72作为分界，将东部分类与西平、西陡分类区分开来。 请注意，边界同时跨越南北生态区分界线与经度-83.72的汇水区将按规则拆分。这些拆分后的零散汇水区在分类时仍保留其从StreamCat数据集获取的原始湿地占比与坡度占比数值，但该数值仅对应原始汇水区的范围，并不代表拆分后区域的实际土地组成。 了解更多关于密歇根州环境、大湖与能源部（EGLE）生物评估的信息：若对本数据及P51点位分类有疑问，请联系Sarah Holden，邮箱：[e-mail]；地图反馈请联系[e-mail]。