Clatsop County occupies Oregon’s far northwest corner, where the Columbia River reaches the Pacific Ocean. Astoria and Warrenton sit near the estuary, while Gearhart, Seaside, and Cannon Beach form a southward line along the ocean side of the county. Inland, the map becomes a dense network of Coast Range ridges, river valleys, and smaller roads, so the county is much more than a chain of coastal communities.
This page compares the county boundary and road network, the distribution of five major cities, waterways around the Columbia estuary and Pacific coast, and the sharp elevation change from low coastal ground to the interior Coast Range. High-resolution JPG originals for all four maps are available together in a downloadable ZIP. These graphics are intended for regional reference, printing, teaching, and general orientation rather than parcel determination, flood-risk analysis, navigation, or survey-grade measurement.
Table of Contents
Starting with Astoria at the Columbia River mouth
Astoria is the easiest reference point for reading the county as a whole. Clatsop County’s official overview identifies Astoria as the county seat, and the supplied map places it on the south side of the Columbia River estuary. Warrenton lies immediately to the west, while the coastal sequence of Gearhart, Seaside, and Cannon Beach continues south along U.S. 101. The county’s most recognizable communities are therefore concentrated around the estuary and ocean edge rather than the mountainous interior.
The north side of the map is dominated by the Columbia River and its broad estuarine waters, while the west side faces the Pacific Ocean. Moving inland, named towns become less frequent and tributaries become more prominent. This shift is important because a map focused only on the shoreline can make central and eastern Clatsop County look empty, even though those areas contain extensive forested ridges, headwater valleys, and local roads.
Two major road directions stand out. U.S. 101 follows the ocean side from Warrenton through Gearhart and Seaside toward Cannon Beach, making it the clearest north-south coastal corridor. U.S. 30 leaves Astoria toward the east, passing the Knappa and Westport side of the county near the Columbia River. Oregon Route 202 cuts through the interior, while U.S. 26 crosses the southern part of the county and connects with Route 53.
The road network is not evenly spaced. Near the estuary and coastal communities, several roads and place names appear within short map distances. In the central and eastern interior, routes are fewer and more winding because they cross hill country and follow available valleys. Straight-line separation can therefore underestimate the distance of an actual trip through the Coast Range, especially when a route must bend around ridges or remain in a river corridor.
The general map also shows smaller Columbia-side names such as Knappa, Svensen, and Westport. These places are useful geographic markers because they extend the county’s inhabited corridor eastward from Astoria. Seeing them alongside the coastal cities makes it clear that Clatsop County has two strong edges: an ocean-facing side along U.S. 101 and a river-facing side along U.S. 30.
Five major cities clustered near the ocean and estuary
The city-distribution map strips away much of the road and terrain detail and highlights five major cities. Its index ranks Astoria first, Seaside second, Warrenton third, Gearhart fourth, and Cannon Beach fifth. All five are positioned close to the western or northwestern edge of the county. The wide interior contains none of these five labels, which makes the contrast between the settled coastal fringe and the mountainous inland area immediately visible.
Astoria and Warrenton form the northern pair. Astoria faces the Columbia estuary, and Warrenton sits farther west where the river mouth, coastal lowlands, and ocean side come close together. On the general map, U.S. 101 and local roads link this area, while the water map reveals how much of the surrounding landscape is shaped by bays, sloughs, and river channels.
Gearhart and Seaside lie on the same coastal corridor south of Warrenton. Seaside is emphasized as the second-ranked city on the supplied index, while Gearhart lies just to its north. Cannon Beach is farther south and separated from the Astoria-Warrenton area by a longer stretch of coast and headlands. For a quick travel-orientation explanation, it is often easiest to read these places as a sequence down U.S. 101 rather than as isolated dots.
The city map is not a complete inventory of every community or a municipal-boundary map. Smaller places shown on the general map, including Knappa, Svensen, Westport, and River Point, are not part of the five-city index. Use the city map when the question is where the larger named communities cluster, then return to the full road-and-boundary map for smaller place names, route numbers, and the county outline.
This coastal concentration also makes more sense when the elevation map is added. The five highlighted cities occupy relatively low terrain near the estuary or ocean, while much of the county interior rises into the Coast Range. The city layer and elevation layer therefore tell complementary stories: one shows where the larger communities are, and the other explains the physical landscape surrounding them.
U.S. 101 on the coast and U.S. 30 along the Columbia corridor
Clatsop County can be read quickly by separating its coastal north-south route from its Columbia-side east-west route. U.S. 101 connects Warrenton, Gearhart, Seaside, and the Cannon Beach side of the county. U.S. 30 begins at Astoria and continues east past Knappa toward Westport. These two corridors serve different geographic settings, and together they organize most of the place names that are easiest to identify on the general map.
Astoria sits close to the transition between them. Travel west and south and the map leads toward Warrenton and the Pacific-side cities; travel east and U.S. 30 follows the river side. Route 202 provides another path into the interior from the Astoria area, crossing hillier terrain where rivers and local valleys become more important than the coastline itself.
Farther south, U.S. 26 crosses the county on an inland east-west path rather than following the ocean. Route 53 branches through the southern interior, and shorter state routes appear near the coastal towns. This road pattern is helpful for understanding why a coastal destination and an inland destination at similar map distances may require very different routes. The Coast Range creates a network of valleys rather than a simple rectangular road grid.
The supplied map is a regional reference and should not be treated as a live navigation product. Construction, storm damage, slides, seasonal restrictions, traffic, and actual driving time are outside its scope. Current road information is important for travel planning, particularly in the interior where a single valley route may have no nearby parallel alternative.
Columbia estuary, coastal rivers, and the Nehalem drainage
The terrain-and-water map makes Clatsop County’s hydrology much clearer than the road map alone. The Columbia River forms the broad northern water body, with Cathlamet Bay labeled along the estuary. The Pacific Ocean occupies the western edge. Between those two large waters, numerous rivers and tributaries drain the Coast Range toward the estuary, the open coast, or the southern Nehalem system.
South and west of Astoria, the Lewis and Clark River and Youngs River stand out as major local channels. Each receives a network of smaller tributaries from the interior hills before reaching the estuary side of the county. Shaded relief shows ridges between those tributaries, making the Astoria hinterland look less like a flat coastal plain and more like a set of short mountain valleys converging toward low water.
The Necanicum River is the clearest coastal river on the west side. It approaches the ocean near the Seaside area after collecting streams from the inland hills. Comparing this river with the city map helps explain the low valley setting around Seaside and Gearhart. The shoreline is important, but the river corridor behind it is another key part of the local landscape.
In the southeast, the Nehalem River follows a winding mountain route, with the North Fork Nehalem River labeled near the southern boundary. This drainage is distinct from the Astoria-side rivers and from the Necanicum coastal system. One county therefore contains several different water settings: the giant Columbia estuary in the north, short coastal rivers in the west, and longer mountain drainages in the south and southeast.
This map is not a flood-hazard or real-time hydrology product. A river label does not establish whether a particular property is in a flood zone, and the map does not show tides, current streamflow, channel depth, or regulatory setbacks. Those questions require current agency data. Here, the purpose is to compare the relative positions of the estuary, coast, rivers, valleys, and county boundary.
From sea-level lowlands to Coast Range ridges near 1,000 meters
The elevation map reveals the strongest physical contrast in Clatsop County. Its legend reports an actual range of roughly 0 to 985 meters and a mean elevation of about 245 meters. The estuary and coastal communities occupy dark-green low terrain, while the central and eastern interior rises quickly through lighter greens and yellows into orange and brown ridge systems.
High relief is especially visible in the northeastern and east-central interior. When this map is compared with the water layer, many short tributaries can be seen descending from higher ridges toward the Columbia River side. That relationship helps explain why the landscape south of U.S. 30 is rugged even though the highway itself follows a relatively low corridor near the river.
The southern and southeastern interior is also mountainous. Valleys followed by the Nehalem River and North Fork Nehalem River appear lower than the ridges around them, producing a strong pattern of narrow green corridors surrounded by warmer elevation colors. Roads in these areas often bend with the valleys because crossing every ridge directly would be impractical.
Along the Pacific side, low coastal ground is narrow. Seaside, Gearhart, and the estuary area occupy green lowlands, but terrain rises not far inland. Cannon Beach is likewise backed by steep coastal hills. The map therefore shows why the county can contain beaches, tidal waters, and high forested ridges within short geographic distances.
Elevation colors are useful for county-scale comparison, not precise site measurement. The generalized surface and shaded relief simplify small landforms, so they should not be used to determine the exact height of a parcel, road grade, building site, or engineering feature. Surveying and design work should rely on source elevation datasets and professional measurements.
Choosing the right Clatsop County map for the question
Start with the general map when the main task is orientation. It places Astoria, Warrenton, Gearhart, Seaside, Cannon Beach, smaller Columbia-side communities, U.S. 101, U.S. 30, and the county boundary in one view. This is the best base image for finding a place first and then moving to a more specialized map.
Use the city-distribution map when the goal is to show where the largest highlighted communities cluster. Five labels keep the page simple and make the western concentration obvious. For a presentation, it can work as a clean first graphic before a more detailed road or terrain map is introduced.
Choose the terrain-and-water map for estuary, river, valley, or coast questions. The Columbia River, Cathlamet Bay, Youngs River, Lewis and Clark River, Necanicum River, Nehalem River, and Pacific Ocean are much easier to separate there than on the general map. Pairing this layer with the road map also helps show which routes follow low river corridors and which cross the hillier interior.
The elevation map is most useful when the subject is physical relief. It shows that the low urban strip near the ocean and estuary occupies only part of the county, while large interior areas rise into the Coast Range. Paired with the water map, it explains why rivers occupy narrow valleys; paired with the city map, it helps show why the five highlighted cities remain concentrated on lower western ground.
For print or close inspection, use the downloadable JPG originals instead of screenshots of the web previews. Each file is approximately 3638 by 2572 pixels, leaving more room to enlarge route numbers, smaller stream lines, and place labels. A focused handout usually works better with one orientation map plus one thematic map than with four reduced images competing for space on the same page.
Clatsop County is often associated with Astoria, Seaside, and Cannon Beach, but the map set shows a broader geography. The Columbia estuary shapes the north, the Pacific shapes the west, coastal towns occupy a narrow lowland fringe, and the Coast Range fills much of the interior with rivers and ridges. Looking across all four layers keeps those pieces connected without forcing every feature into a single crowded graphic.
Frequently Asked Questions
Which map is best for comparing Astoria and Seaside?
Use the general road-and-boundary map first. Astoria is shown beside the Columbia River estuary, while Seaside lies farther south on the U.S. 101 coastal corridor, so both direction and road context are visible at once. The city-distribution map is a simpler alternative when you only need to compare the five highlighted communities without the extra road and stream detail.
Do the Columbia River and Necanicum River cross the same part of the county?
No. The Columbia River is the broad northern estuary and forms the dominant water feature along the county’s north side. The Necanicum River is much smaller and drains toward the Pacific near the Seaside area on the west side. The terrain-and-water map is useful because it shows those two systems together while preserving the strong difference in scale and location.
Can the roughly 0 to 985 meter elevation range be used for surveying or construction design?
No. That range is a county-scale reference for comparing low estuary and coastal ground with higher Coast Range terrain. The map uses a generalized elevation surface and shaded relief, so it does not provide parcel-level or engineering-grade heights. Precise work should use authoritative source elevation data and professional survey measurements.
Map File Information
The download ZIP contains high-resolution JPG originals for the Clatsop County road-and-boundary map, major-city map, terrain-and-water map, and elevation map.
- Included Files: 4 maps
- File Type: JPG
Related Maps
Sources and references
General county geography, the Astoria county-seat context, and the Columbia River/Pacific Ocean setting were checked against the official Clatsop County overview. Local natural-area information is available from Clatsop County Parks. General boundary references are available from U.S. Census Bureau TIGER/Line, 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.
