Clackamas County stretches from the southeastern edge of the Portland metropolitan area into the Cascade Range and the high country around Mount Hood. Oregon City, West Linn, Lake Oswego, and Happy Valley sit close together in the northwest, while Sandy and Estacada mark the transition toward a much larger landscape of forested ridges and river valleys. The contrast is unusually strong for one county: dense suburban settlement occupies a relatively small western corner, but the county boundary reaches far east across rugged terrain. High-resolution map files are available for download in the section below.
This page uses four maps to explain that transition through boundaries and roads, the concentration of major cities, river systems such as the Clackamas, Sandy, and Molalla, and the sharp rise in elevation toward the Cascades. High-resolution JPG versions of all four maps can be downloaded together in one ZIP file for larger viewing or printing. These maps are intended for geographic orientation and general reference; legal boundary work, parcel research, flood decisions, navigation, engineering, and survey-grade elevation work require current authoritative data.
Table of Contents
From Oregon City to the Cascade high country in one county
The easiest way to understand Clackamas County is to begin with the west-to-east change. Wilsonville and Canby lie on the western side, while Oregon City, West Linn, Lake Oswego, and Happy Valley cluster farther north. Roads and place labels are dense in this corner because it is tied closely to the Portland urban area. Move east past Sandy or Estacada, however, and large built-up areas disappear. Rivers, tributaries, mountain relief, and a smaller number of long road corridors become the dominant features.
Oregon City is the county seat, and the county government’s own overview describes a place that includes urban, suburban, rural, and wild settings between the Willamette River and Mount Hood National Forest. That variety is visible in the supplied map. Oregon City works as a practical western reference point: West Linn and Lake Oswego are nearby to the north, Canby and Molalla lie to the south, Estacada is farther east, and Sandy sits on the northeastern route toward the mountains.
The county outline is also informative. It is not a simple rectangle: the northwest edge turns around several urban communities, and a narrow western extension reaches toward Wilsonville. The eastern and southeastern sides enclose a much broader mountain area with comparatively few city labels. Neighboring Multnomah County is to the north, Hood River and Wasco counties are on the eastern side, and Washington, Yamhill, and Marion counties lie along portions of the west and southwest. Seeing those neighbors helps explain why the county connects both to the Portland area and to the interior Cascades.
Road geometry changes with the landscape. In the lower western areas, routes are relatively direct and communities are close together. In the central and eastern portions, roads bend through valleys and around ridges. Estacada is especially useful as a transition point because it sits near the entrance to the Clackamas River mountain corridor. Sandy plays a similar role on U.S. 26, where the road continues east toward higher Cascade terrain rather than another dense chain of cities.
The county’s official introduction gives an area of roughly 1,879 square miles and emphasizes the span from Happy Valley and other urban communities to forested and mountainous country. That scale matters when reading the map. The closely spaced places around Oregon City occupy only part of the county, so a trip across the eastern half can involve much longer distances and very different terrain than a short suburban trip in the northwest. Treating the western urban cluster and the mountain interior as distinct geographic zones makes the rest of the maps easier to interpret.
Why the major-city labels crowd into the northwest corner
The city map simplifies the county to show six major cities: Lake Oswego, Oregon City, Wilsonville, West Linn, Happy Valley, and Milwaukie. Every one of those labels appears near the northwest or western edge. The rest of the county is intentionally quiet on this version, making the settlement contrast obvious even before roads or elevation are considered. It is a useful companion to the general map because it separates the urban pattern from the much larger background of streams and mountain terrain.
Oregon City and West Linn sit close to one another along the Willamette River corridor, with Lake Oswego and Milwaukie farther north. Happy Valley lies east of that group and helps mark the edge between the Portland-side urban cluster and the more open interior. Wilsonville occupies the western projection farther south, close to the I-5 corridor. On the general map, this concentration is reinforced by the number of connecting highways and short distances between neighboring place labels.
Several other communities are important even though they are not part of the six-city ranking graphic. Canby and Molalla anchor the lower western and southwestern areas, Sandy stands on the northeastern U.S. 26 corridor, and Estacada lies near the Clackamas River route into the mountains. Adding those places back to the simplified city pattern shows that settlement does not stop at the urban fringe, but it becomes smaller and more widely spaced as the landscape turns rural and mountainous.
The city map should not be treated as a complete municipal boundary map. It is a ranked distribution view, useful for showing where large population centers are located relative to the county as a whole. Exact city limits, annexations, and jurisdiction questions require current administrative boundary data. For a classroom slide or regional overview, however, the strong clustering in one corner communicates an important fact quickly: most of the county’s visible large-city pattern belongs to the Portland-facing northwest rather than the interior Cascades.
That clustering also affects how distance feels on the ground. A traveler moving among Lake Oswego, West Linn, Oregon City, and nearby communities encounters several route choices and frequent developed areas. East of Estacada or Sandy, the same map scale covers long stretches with few urban labels and a much stronger influence from river valleys and mountain relief. The city map therefore works best as a first clue to settlement density, followed by the road, water, and elevation maps for the reasons behind that pattern.
U.S. 26 and Route 224 carry the road network into the mountains
The road pattern shows that there is no single east-west spine across Clackamas County. In the north, Routes 212 and U.S. 26 connect the Happy Valley and Sandy direction with the mountain corridor. In the center, Route 224 runs through the Estacada area and follows the broader Clackamas River side of the county. Around Oregon City and West Linn, 205 and 213 help organize the urban network, while Route 211 crosses the Molalla area farther south.
U.S. 26 is the most conspicuous long corridor in the northeastern portion. After passing Sandy, it continues toward the eastern county line and the Mount Hood area. The road becomes more curving as it enters higher terrain, which is consistent with the ridges and drainage lines visible on the other maps. Rather than linking a continuous sequence of large towns, this corridor increasingly serves mountain access, so the spacing and character of destinations differ markedly from the western suburbs.
Route 224 provides a different path into the interior. Near Estacada it approaches the Clackamas River system and then bends through mountainous country where ridges constrain direct travel. When the water map is placed beside the road map, the route’s relationship with the river valley becomes much easier to see. U.S. 26 and Route 224 therefore illustrate two separate ways that the western settlement area connects with the Cascades: one through the Sandy side of the county and one through the Clackamas River basin.
Canby and Molalla form a third, lower-elevation part of the road story. Route 211 runs through the Molalla area, while local and state routes connect Canby with Oregon City and the western edge of the county. These roads cross a landscape that is less mountainous than the eastern half, but it is still distinct from the dense northern suburban grid. Using Oregon City as a reference, it is useful to think of Canby and Molalla to the south, Estacada to the east, and Sandy to the northeast as separate gateways into different parts of the county.
This general map is not a navigation product. Seasonal closures, wildfire restrictions, snow conditions, construction, and current travel times are outside its purpose. The limitation matters most in the mountain half of the county, where a short straight-line separation can still require a long route around terrain. Use the map to understand the broad road framework and the transition from urban roads to valley-following mountain corridors, then check current transportation information before an actual trip.
Clackamas, Sandy, and Molalla rivers divide the interior into separate valleys
The terrain-and-water map reveals how thoroughly the eastern county is dissected by drainage. The Sandy River dominates the north, the Clackamas River forms a major central and southeastern system, and the Molalla River drains the southwest. Near the low western edge, the Pudding and Willamette river systems occupy gentler terrain. These are not minor background features: they organize valleys, separate ridges, and help explain the directions taken by roads and small communities.
The Sandy River crosses the northeastern mountain area and is joined by the Salmon River near the eastern side. Bull Run Reservoir No. 2 and Roslyn Lake are also labeled farther north, adding to the concentration of water features in this high-relief part of the county. The underlying hillshade shows steep ridges pressing close to the rivers. When compared with the general map, U.S. 26 can be seen threading through the same broader mountain environment rather than across a broad open plain.
The Clackamas River is the central water feature. Its valley extends through the mountainous interior, while Oak Grove Fork Clackamas River reaches toward the southeastern side near Timothy Lake. Numerous short tributaries descend from surrounding ridges and join the main channels. That branching pattern is much denser than the simplified city map suggests, and it helps explain why the interior is better understood as a collection of valleys and watersheds rather than a single continuous plateau.
The Molalla River and North Fork Molalla River occupy the southwestern mountain foothills, collecting tributaries before moving toward the lower country. Farther west, the Pudding River follows gentler terrain near the agricultural and urban side of the county. The contrast between these drainages is useful for orientation: Sandy marks the northeast, Clackamas the central interior, and Molalla the southwest. A person familiar with those three systems can locate many other features more quickly.
This map is not a flood-hazard map and does not show real-time streamflow, reservoir level, water quality, or regulatory flood zones. A river drawn near a community should not be used by itself to infer flood risk for a property. For safety, engineering, permitting, or current hydrologic conditions, use current USGS and local or state agency sources. The purpose here is to show the geographic relationship between streams, reservoirs, valleys, and mountain relief.
Elevation rises from the western lowlands to Mount Hood by more than three kilometers
The elevation map shows the county’s strongest visual contrast. Its legend reports an actual range of roughly 2 meters to 3,397 meters, with a mean elevation of about 654 meters. Oregon City, Canby, Wilsonville, and much of the western side occupy dark-green lowlands, while yellow, orange, and brown terrain expands rapidly toward the central and eastern Cascades. The highest colors appear around the Mount Hood side of the county in the northeast.
In the northeast, high ridges overlap the area where the Sandy and Salmon rivers cut through mountain valleys. The water map shows those channels, while the elevation map makes their depth and surrounding relief easier to appreciate. The same comparison helps with U.S. 26: what looks like a simple long road on the general map is actually crossing a landscape where elevation changes dramatically and ridges constrain where a highway can be built.
The central and southeastern interior is also rugged. Around the Clackamas River and Oak Grove Fork, multiple ridge systems divide long green and yellow valleys. Farther south, the upper Molalla drainage cuts into a similarly broken landscape. These areas explain why there are few large cities in the interior and why routes often follow valley floors. Settlement and transportation patterns are not determined by elevation alone, but the map makes the physical constraints much more visible.
The western side is much lower and more open. Broad green areas around the urban cluster and the Canby-Wilsonville side contrast sharply with the eastern mountains. Clackamas County’s official description of urban, suburban, rural, and wild environments is therefore not merely a land-use distinction; it also corresponds to a large physical transition from low valley terrain to high Cascade landscapes.
The elevation values are useful for regional comparison, not for survey or construction work. The shaded surface generalizes terrain so that large landforms are easy to recognize, and an individual point may differ from what a color band suggests. Engineering design, drainage studies, building work, and precise site elevation should rely on original USGS elevation data and professional surveying rather than this generalized map image.
Choosing the map that best fits a city, river, or terrain question
For a first look, start with the general county map. It places Oregon City in relation to Lake Oswego, West Linn, Happy Valley, Canby, Molalla, Sandy, and Estacada while also showing major route numbers and the county outline. Once that framework is familiar, the other maps become easier to read because each removes some detail and emphasizes one part of the geography.
Use the city map when the main question is where larger communities are concentrated. Its six labels make the northwest clustering immediately visible without the visual weight of every river and road. Use the terrain-and-water map when the subject is mountain valleys, watersheds, rivers, or reservoirs. The Sandy, Clackamas, and Molalla systems are much clearer there than on the general road map.
The elevation map is the best explanation for why the eastern half feels so different from the Portland-side communities. Low green terrain dominates the west, but ridge after ridge rises toward the Cascades and Mount Hood. Pairing elevation with the water map shows how rivers occupy the lower corridors between those ridges. Pairing elevation with the road map shows why U.S. 26 and Route 224 follow specific valleys rather than straight lines across the county.
For print or presentation use, the downloadable originals are preferable to the web previews. Each JPG is approximately 3638 × 2572 pixels, allowing smaller labels and tributaries to remain readable at larger sizes. Rather than shrinking all four maps onto one page, choose the pair that matches the topic: general plus city for settlement and orientation, or water plus elevation for rivers and mountain terrain.
Clackamas County cannot be summarized well as only a Portland suburb or only a Mount Hood county. The northwest holds a tight group of cities, the middle contains Estacada and the Clackamas River corridor, U.S. 26 reaches through Sandy toward high mountain country, and the Molalla drainage creates a separate southwestern landscape. The four maps are most useful when those parts are compared together, because each reveals a different reason the county changes so sharply across its broad east-west span.
Frequently Asked Questions
Which map best shows the change from Oregon City toward Mount Hood?
Start with the general road and boundary map because it shows Oregon City, Sandy, U.S. 26, and the eastern county in one view. Then compare it with the elevation map. The western side appears as low green terrain, while the Mount Hood side rises into orange and brown high country. Together they explain both the route direction and the physical change that occurs along the way.
Do the Clackamas River and Sandy River drain the same part of the county?
No. On the supplied terrain-and-water map, the Sandy River occupies the northeastern mountain area and connects with the Salmon River system, while the Clackamas River crosses the central and southeastern interior. The Molalla River forms another important drainage to the southwest. Distinguishing those basins is one of the easiest ways to divide the mountainous half of the county into understandable geographic sections.
Can the roughly 2 to 3,397 meter elevation range be used for surveying or building design?
No. The range is a regional reference that shows the contrast between low western terrain and the high Cascades. The map uses a generalized elevation surface and shaded relief, so it does not provide survey-grade heights for individual parcels, buildings, or road points. Precise work should use original USGS 3D Elevation Program data together with professional survey information when required.
Map File Information
The ZIP contains high-resolution JPG originals of the Clackamas County boundary and road map, major-city map, terrain and water map, and elevation map.
- Included Files: Use only the versions confirmed in the article and supplied images
- File Type: Use the confirmed download contents
- Intended Use: Printing, education, presentations, and map-based projects
Related Maps
Sources and references
General county geography, history, and the Oregon City county-seat context were checked against the official Clackamas County overview. Boundary reference data are available from the U.S. Census Bureau TIGER/Line program, hydrography from USGS National Hydrography, and elevation data from the USGS 3D Elevation Program.
Green Map creates custom-edited map images using open geographic data sources such as geoBoundaries, Natural Earth, OpenStreetMap, and government open data. These maps are edited visual materials, not raw data files, and are provided for education, documents, presentations, and graphic reference.
