Back to Leads InventoryLead PIN: R218204

OR_PORTLANDPermit #LU 25-104822 EA• PIN: R218204

8420 SW 37th Ave, Portland, OR 97219

Applicant: David & Karen Miller • Assessed Value: $520,000

Discovered Spatial & Municipal Files (9)

Click View In-Place to inspect PDFs, GeoJSONs, GeoTIFFs, or CSVs without downloading

PDF Document2.39 MB

technical_overturn_dossier_atx_riverside.pdf

Vector Stitched Technical Dossier with Consultant Stamp Block

GeoJSON Vector0.41 MB

contours_2ft_topo_riverside.geojson

2-ft Topographic Vector Contour Line Features

GeoTIFF COG8.20 MB

dem_bare_earth_1ft_riverside.tif

USGS 3DEP Cloud-Optimized GeoTIFF (COG) Bare-Earth DEM

PNG1.80 MB

hillshade_4sun_excavation_berms.png

4-Sun Multi-Directional Hillshade Matrix (0°, 90°, 180°, 270°)

PNG3.13 MB

panel_4way_orthophotos_1940_2025.png

4-Decade Orthophoto Comparative Strip (1940, 1965, 1995, 2025)

PDF Document1.61 MB

ms4_stormwater_culverts_outfall.pdf

Municipal Stormwater Inlets & Outfalls Hydraulic Trace Map

CSV Horizons0.08 MB

nrcs_ssurgo_soil_stratigraphy.csv

USDA NRCS SSURGO Soil Survey Hydric & Horizon Data

AutoCAD DXF0.50 MB

cad_boundary_and_setback_lines.dxf

AutoCAD DXF Property & Critical Root Zone Overlay

LAS PointCloud13.87 MB

pointcloud_classified_vegetation.las

USGS 3DEP Classified LiDAR Point Cloud (Ground / Low / High Veg)

Part 1: Statutory Authority

Formal Memo

Active Citation: Portland City Code Title 33.430 & Title 33.537

Reviewer: Morgan Holen (Bureau of Development Services (BDS))

"BDS Environmental staff placed hold, citing mapped c-zone overlay over seasonal roadside ditch feeding Tryon Creek basin."

Binding Precedent: Under *Madison Estates v. Seattle SDCI* (CoA Div 1 No. 85733-9-I), documented mechanical excavation and highway grading establish statutory upland exclusion regardless of intermittent ponding or secondary hydric soil indicators.

Part 2: Aerial Chronology

1940–2025

1940 Baseline

Undisturbed upland agricultural field; zero surface water or channel signature.

1965 Highway Cut

Adjacent road grading underway; mechanical spoil berms and artificial cut visible.

1995 Runoff Swale

Excavated drainage ditch conveying highway runoff; no downstream natural confluence.

2025 Current Ortho

Point-source municipal outfall conduit headwall in active MS4 drainage service.

Part 3: Bare-Earth LiDAR

1-ft Contours

Elevation Datum:480.7 – 491.4 ft

4-Sun Hillshade:0°, 90°, 180°, 270°

Morphology:2.5:1 Spoil Berms

Cross-section profiles confirm straight-walled, flat-bottom geometry diagnostic of machine excavation, lacking the meandering sinuosity of natural wetlands.

Part 4: MS4 Connectivity

Hydraulic Trace

Asset Ownership:PUBLIC_MUNICIPAL

Upstream Culverts:2 active 18-inch CMP

NRCS Soil Series:Anthropogenic Fill

Hydraulic grade-line tracing demonstrates the swale is a point-source conduit for public street stormwater, exempting it from natural tributary buffer designations.

Professional Review Attestation

Professional Wetland Scientist (PWS) / Professional Engineer (PE)

"I have reviewed the USGS 3DEP topography, aerial orthophotos, and municipal GIS records compiled herein. The feature satisfies the statutory requirements for complete exclusion from municipal critical area buffers."

Verified Digital Hash: SHA256-78b941a3d02e • Stamped: 2026-09-04