{ "title": "CNHP Fens2025V2 classification and campaign footprint comparison", "verified_date": "2026-10-10", "status": "Agency-source mapping analysis using stored illustrative reservoir boundaries", "source_service": "https://cnhp.colostate.edu/arcgis/rest/services/Wetland_Inv/Fens_2025_V2/MapServer/0", "metadata_url": "https://cnhp.colostate.edu/arcgis/rest/services/Wetland_Inv/Fens_2025_V2/MapServer/layers?f=pjson", "source_report": "https://cnhp.colostate.edu/download/documents/2025/Inventory_of_Fens_in_the_WRNF_FINAL.pdf", "report_definitions": "CNHP 2025 Table 1, printed p.8: field-confirmed fen has more than 40 cm of peat; confirmed peat-accumulating wetland has less than 40 cm. The service exposes FEN_STATUS rather than the report’s separate likely, possible and low-confidence ratings.", "mapping_version_note": "The service identifies the layer as Fens (CNHP 2025); this snapshot was retrieved October 10, 2026. No publication or edit timestamp is supplied. The White River National Forest service totals of 271 Confirmed Fen and 75 Confirmed Peat-Accumulating Wetland features match the 2025 report; Potential Fen is the broader service category.", "map_extent": { "crs": "EPSG:32613", "bounds": [ 368000, 4350500, 384500, 4371500 ], "counts": { "Confirmed Fen": 54, "Potential Fen": 560, "Confirmed Peat-Accumulating Wetland": 3 }, "total": 617, "query_url": "https://cnhp.colostate.edu/arcgis/rest/services/Wetland_Inv/Fens_2025_V2/MapServer/0/query?where=1%3D1&geometry=%7B%22xmin%22%3A+368000%2C+%22ymin%22%3A+4350500%2C+%22xmax%22%3A+384500%2C+%22ymax%22%3A+4371500%2C+%22spatialReference%22%3A+%7B%22wkid%22%3A+32613%7D%7D&geometryType=esriGeometryEnvelope&spatialRel=esriSpatialRelIntersects&outFields=%2A&outSR=32613&f=json" }, "lower_creek_extent": { "crs": "EPSG:32613", "bounds": [ 380650, 4371500, 384070, 4374380 ], "feature_count": 0, "query_url": "https://cnhp.colostate.edu/arcgis/rest/services/Wetland_Inv/Fens_2025_V2/MapServer/0/query?where=1%3D1&geometry=%7B%22xmin%22%3A+380650%2C+%22ymin%22%3A+4371500%2C+%22xmax%22%3A+384070%2C+%22ymax%22%3A+4374380%2C+%22spatialReference%22%3A+%7B%22wkid%22%3A+32613%7D%7D&geometryType=esriGeometryEnvelope&spatialRel=esriSpatialRelIntersects&outFields=%2A&outSR=32613&f=json" }, "homestake_basin": { "source_url": "https://api.water.usgs.gov/nldi/linked-data/comid/1320344/basin?f=json&simplified=false", "definition": "Complete upstream NHDPlusV2 catchments at the Homestake Creek outlet immediately before the Eagle River confluence.", "fresh_snapshot_matches_previous": true, "count_method": "Query source polygons over the entire basin bounding rectangle, then select positive-area intersections in EPSG:32613. All 175 selected polygons lie wholly within the basin. Counts describe mapped inventory features rather than independent survey sites.", "counts": { "Confirmed Fen": 15, "Potential Fen": 160, "Confirmed Peat-Accumulating Wetland": 0 }, "confirmed_source_objectids": [ 16233, 16234, 16244, 16246, 16247, 16248, 16249, 16257, 16258, 16262, 16263, 16267, 16315, 16316, 16317 ] }, "illustrative_footprint_comparison": { "source_sha256": "27034cc95a70c2c5edf9a906268a7ded9e46b92588ab09f5ff70cbb185959d60", "source_method": "Stored A–D full-pool boundaries from the campaign’s connected-terrain model. These describe illustrative reservoir surfaces rather than an approved project and associated facilities.", "crs": "EPSG:32613", "method": "Reconstruct valid source polygons including holes, then intersect each stored full-pool boundary with the current V2 agency polygons in EPSG:32613. Reproduced footprint areas match stored metadata to rounding. Geometry was not simplified for the intersection.", "results": [ { "scenario": "A", "footprint_area_m2": 1488592.14, "intersecting_confirmed_fen_features": 0, "intersecting_potential_fen_features": 0, "intersecting_confirmed_peat_wetland_features": 0, "mapped_fen_intersection_m2": 0 }, { "scenario": "B", "footprint_area_m2": 854659.78, "intersecting_confirmed_fen_features": 0, "intersecting_potential_fen_features": 0, "intersecting_confirmed_peat_wetland_features": 0, "mapped_fen_intersection_m2": 0 }, { "scenario": "C", "footprint_area_m2": 953928.59, "intersecting_confirmed_fen_features": 0, "intersecting_potential_fen_features": 0, "intersecting_confirmed_peat_wetland_features": 0, "mapped_fen_intersection_m2": 0 }, { "scenario": "D", "footprint_area_m2": 1839728.96, "intersecting_confirmed_fen_features": 0, "intersecting_potential_fen_features": 0, "intersecting_confirmed_peat_wetland_features": 0, "mapped_fen_intersection_m2": 0 } ], "interpretation": "No current V2 fen polygons intersect these four modeled pools. The September 18 inventory’s Potential Fen polygons overlap the same models, and mapped wetlands also overlap them. The result records a difference between inventory versions rather than a field finding that wetlands or groundwater effects are absent.", "source_file": "modeled-footprints.json" }, "historical_layer_note": "The September 18, 2026 fen inventory remains a separately labeled historical comparison. Published reservoir-overlap figures use that dated geometry; the interactive current layer uses V2 source classifications.", "cartographic_overlap_note": "Within the main map rectangle, current Potential Fen and Confirmed Fen polygons overlap by 1.96 square metres. Confirmed Fen takes display priority in that overlap; the peat-accumulating wetland class has no overlap with the other two classes.", "archives_sha256": { "V2_campaign_extent.json": "93012a7dab9c548c48beea464c88db268f4a9e133f8f291212b7ecc4ac10ee30", "V2_wholebasin_bbox.json": "ad41e70220af922ad18171a97ac1368a780b6bf88a544213e21bf70cb05045d0", "V2_lowercreek_extent.json": "6eb8b3a799f6210cd53da480f1f2491e7373152dd7ffec7af3c1ecf64d2550aa", "Fens_2025_V2_layers.json": "47451124d5f6cbcba885347d9bb62f97543210aebc80701c4b44dd205b62b757", "homestake-basin-official-current.geojson": "52eacab8da3f1bef0e06212089bc7c6ed2c12d2f32105134039ea76fb9bd653f" } }