Morrow County stretches from the Columbia River corridor in north-central Oregon into much higher country toward the Blue Mountains. Boardman and Irrigon sit near the river and Interstate 84, while Ione, Lexington, and Heppner are spaced farther south across rolling interior terrain. The four maps on this page show county boundaries, roads, the main city distribution, waterways, and elevation, and the high-resolution JPG versions used for the article can also be downloaded together as a ZIP file. High-resolution map files are available for download in the section below.
The county makes more sense when it is viewed as several distinct geographic settings rather than one uniform area. The north is broad, low, and closely tied to the Columbia River transportation corridor. Oregon 74 links the smaller interior communities of Ione, Lexington, and Heppner, while Oregon 207 reaches into the higher southern part of the county. Streams become more deeply set into valleys as the land rises southward, and the road network becomes noticeably less dense away from the river towns.
Table of Contents
Boardman and Irrigon occupy the low Columbia River edge
The general county map places Boardman and Irrigon along the northern edge of Morrow County, close to the Columbia River. Boardman lies near Interstate 84 and the U.S. 30 corridor, while Irrigon is farther east near U.S. 730. These two cities are much closer to one another than the northern towns are to Heppner, and the surrounding road network follows the broad east-west river corridor. The Oregon Blue Book identifies the Columbia River as one of the county’s major geographic features, which is immediately apparent on the map.
South of the interstate corridor, settlement becomes sparse very quickly. Large areas of the county show agricultural roads, shallow drainages, and long distances between named places rather than a continuous chain of towns. That contrast is important because the northern communities are tied to a major regional transportation route that does not continue through the county’s interior. A reader planning a broad regional route can therefore use the map to distinguish the Columbia River travel corridor from the slower network of state highways farther south.
County and state sources describe a related land-use transition. Irrigated agriculture is especially important in the north, broad wheat-growing and ranching country occupies much of the center, and forested mountain country becomes more important toward the south. The maps do not show land use directly, but the change is reflected in settlement spacing, relief, and the way roads cross the landscape. Boardman and Irrigon belong to a very different setting from the uplands beyond Heppner.
Five city markers reveal two widely separated settlement groups
The ranked city map highlights Boardman, Irrigon, Heppner, Ione, and Lexington. Boardman and Irrigon form the northern pair close to the Columbia River, whereas Ione and Lexington sit along the interior route toward Heppner. Heppner is farther southeast and serves as the county seat. Even without detailed road labels, the spacing of the five markers makes the county’s settlement pattern clear: the largest northern communities are separated from the smaller central and southern communities by a large rural interior.
The values printed in the city index are best treated as comparison figures from the data used when the map was produced, not as a substitute for the latest official population estimates. Boardman has the largest symbol on the sheet, followed by Irrigon and Heppner, with Ione and Lexington shown at a much smaller scale. For current population counts, demographic change, or planning statistics, readers should consult the U.S. Census Bureau or current county records. The geographic placement of the cities, however, remains useful for understanding travel and regional relationships.
Heppner is smaller than Boardman but has a different function because the county courthouse and several county offices are located there. Lexington also hosts county facilities and an airport, while Ione sits northwest of Lexington along Oregon 74. The city map is therefore most useful when it is read together with the road map. One sheet emphasizes relative city size and separation, while the other shows the state highways that connect the river corridor with the county’s administrative and agricultural interior.
Willow Creek and Rhea Creek cross the interior below the Columbia River
The terrain-and-water map begins with a much larger water feature than anything in the county interior. The Columbia River forms the northern edge, with the mapped reach labeled Lake Umatilla, and the West Extension Irrigation Canal appears just south of the river corridor. These features help explain why the northern landscape can support extensive irrigated agriculture despite the generally dry climate of the region. Away from the river, the water network changes to smaller streams that follow shallow valleys and progressively rougher terrain.
Willow Creek is one of the clearest interior waterways because it passes through the Heppner area and continues northwest through a broad valley system. Rhea Creek enters the same general part of the county from the southwest, and Willow Creek Lake is marked near Heppner. Farther east, Hinton Creek and Little Butter Creek run through narrower valleys, while Butter Creek crosses the northeastern interior. These stream names provide useful landmarks on a map where many roads and settlements are otherwise widely separated.
Rock Creek and additional small tributaries become more prominent in the higher southern country, and Lake Penland appears in the southeast. The map is intended for regional hydrography and terrain reference rather than real-time water decisions. Seasonal flow, reservoir levels, flood conditions, legal water boundaries, irrigation rights, and boating or fishing safety can change or require more detailed information. Those uses should be checked against current USGS, county, or other responsible-agency sources.
Elevation climbs from the river lowlands toward the Blue Mountains
The elevation map gives Morrow County a strong north-to-south gradient. Dark green covers much of the Boardman and Irrigon area, indicating the county’s lowest broad terrain near the Columbia River. Relief becomes more visible through the center, where rolling plateaus and stream valleys break up the surface. South and southeast of Heppner, yellow and brown tones spread across increasingly rugged ridges. The highest concentration of relief lies toward the Blue Mountains and the Umatilla National Forest region.
The legend on the supplied map reports an actual elevation range of roughly 81 to 1,804 meters and a county-wide mean near 712 meters. Those figures describe the generalized elevation surface used for this map. They should not be treated as survey elevations for individual roads, structures, or parcels. At county scale, the most useful information is the contrast between the broad, low northern plain and the much higher southern and southeastern landscape.
Transportation follows the same physical change. Interstate 84 can cross the low northern terrain in a relatively direct line, while Oregon 74 and Oregon 207 bend through valleys and rolling uplands farther inland. South of Heppner, roads become more widely spaced as ridges rise and stream valleys deepen. The elevation sheet works well for classroom comparison, broad route context, and regional reference, but detailed engineering, surveying, slope measurement, or backcountry navigation requires higher-resolution authoritative elevation data.
Oregon 74 links Ione and Lexington with the Heppner county seat
Oregon 74 provides a useful way to trace the interior of Morrow County. Ione lies in the central-western part of the county, Lexington is farther southeast, and Heppner follows beyond it. The route crosses a landscape that is much more rural than the Interstate 84 corridor. Towns are smaller, side roads are farther apart, and shallow drainages gradually give way to more pronounced valleys. The sequence makes it easy to see how the county changes between its agricultural center and the higher country near Heppner.
Heppner occupies the Willow Creek valley and serves as the county seat, so several road and public-service connections converge there. Oregon 207 reaches toward the higher country south of town, while routes toward Lexington and Ione lead back across the interior. The terrain-and-water map adds another layer to that picture: the town is associated with a recognizable stream corridor rather than an open river plain. The elevation map then shows the ridges becoming substantially higher on the southern side of the county.
The far south is visually dominated by relief rather than by city symbols. Rock Creek and smaller tributaries cut across mountain slopes, and the brown elevation colors become much more extensive. State sources identify the Blue Mountains and Umatilla National Forest among Morrow County’s major points of interest. That mountain setting completes a broad geographic progression from Columbia River transportation and irrigated agriculture in the north through wheat and ranching country in the center to forested highlands in the south.
Choosing a Morrow County map for roads, water, or relief
Start with the general county map when you need the boundary, the largest selection of place names, and the major road network on a single page. It is the most convenient sheet for locating Boardman, Irrigon, Ione, Lexington, and Heppner and for comparing Interstate 84, U.S. 730, Oregon 74, and Oregon 207. The city-distribution map is more efficient when the question is simply how the five highlighted cities are arranged and how far the northern pair sits from the interior communities.
The terrain-and-water map is the best choice for comparing the Columbia River and Lake Umatilla with Willow Creek, Rhea Creek, Butter Creek, Rock Creek, and other interior drainages. It also shows valleys and ridges that are less obvious on the road map. The elevation map simplifies the same terrain change into a color scale, making the low northern plain and the high southern country easy to compare. Using the sheets together connects settlement, transportation, drainage, and relief without asking one map to show every detail.
The WebP images in the article are optimized for on-page viewing. The ZIP below contains the high-resolution JPG originals for the county, city distribution, terrain and water, and elevation maps. They can be used for printing, classroom work, presentations, and general regional reference. They are not legal boundary documents, parcel surveys, flood determinations, engineering elevation products, or substitutes for current road and field-navigation information.
Frequently Asked Questions
Which maps best show the difference between Boardman and Heppner?
Use the general and elevation maps together. Boardman sits near the Columbia River and Interstate 84 in the low northern part of the county, while Heppner is much farther south in the Willow Creek valley. The road map shows the distance and route relationship, and the elevation sheet makes the transition from broad lowland terrain to rolling uplands and higher ridges especially clear.
Does the ranked city map include every community in Morrow County?
No. It focuses on five incorporated cities: Boardman, Irrigon, Heppner, Ione, and Lexington. The general map includes more road and surrounding-place context, while county sources also describe rural communities and service areas beyond the five city markers. The ranked map is intended for a quick comparison of the main incorporated cities rather than a complete inventory of every settlement or facility.
What are the main waterways shown inside Morrow County?
The Columbia River and the mapped Lake Umatilla reach dominate the northern boundary. Inland, the water map labels Willow Creek, Rhea Creek, Butter Creek, Hinton Creek, Rock Creek, Willow Creek Lake, and Lake Penland, among other smaller drainages. Willow Creek is particularly useful for understanding the Heppner area. Current flow, flood, reservoir, and water-right information should be checked with USGS or the appropriate local agency.
Map File Information
The high-resolution JPG originals for the county, city distribution, terrain and water, and elevation maps shown on this page are available together in one ZIP file.
- 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
- Morrow County official website
- Morrow County – City Resources
- Oregon Blue Book – Morrow County
- U.S. Census Bureau TIGER/Line Shapefiles
- USGS National Hydrography
- USGS 3D Elevation Program
These references provide county background and authoritative sources for boundaries, hydrography, and elevation. Road closures, wildfire restrictions, reservoir conditions, river levels, and other field conditions can change, so current information from the responsible agency should be checked before travel or on-site work.
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.
