Download the high-resolution JPG originals for this Summit County Colorado Map in the ZIP below. The page shows Breckenridge, Silverthorne, Frisco, Dillon, Keystone, and Blue River, the major mountain road network, the Blue River and Snake–Swan river systems, Dillon and Green Mountain reservoirs, and a countywide elevation range that rises above 4,300 meters. WebP versions are provided for quick viewing, while the full-size JPG files are better for printing, detailed inspection, and offline reference.
Dillon Reservoir is the easiest geographic anchor for reading Summit County. Frisco, Dillon, and Silverthorne cluster around its western, eastern, and northern sides, while Breckenridge and Blue River extend south along the Blue River valley. Keystone sits east of the reservoir in the Snake River valley, and Copper Mountain lies west-southwest of Frisco along the I-70 mountain corridor. The county is compact, but high ridges and separate valleys make the road and settlement pattern much more complex than the short map distances suggest.
Table of Contents
Dillon Reservoir as the meeting point for Frisco, Dillon, and Silverthorne
The county map makes the Dillon Reservoir area the clearest transportation and settlement center. Frisco sits on the west side of the reservoir, Dillon is close to the eastern shore, and Silverthorne occupies the Blue River valley just north of the dam area. I-70 and U.S. 6 form the main east-west corridor through this cluster, while Colorado 9 links Silverthorne southward through the Frisco area toward Breckenridge and Blue River.
Other parts of the county connect through narrower mountain routes. Copper Mountain appears in the southwest near the I-70 corridor, and Colorado 91 continues south from that area toward Lake County. Keystone is east of Dillon Reservoir along the Snake River valley, while Montezuma lies farther into the eastern high country. Heeney appears in the north near Green Mountain Reservoir, giving the county a second, more remote Blue River setting well beyond the central Dillon Reservoir cluster.
Six ranked communities shaped by separate mountain valleys
The city layer is a ranked distribution map, not a distance-connector map. Its CITY INDEX lists Breckenridge first, Silverthorne second, Frisco third, Blue River fourth, Keystone fifth, and Dillon sixth. No straight-line mileage or driving distance is shown, so the map is best used to compare where the six communities sit relative to Dillon Reservoir and the surrounding valleys.
Breckenridge and Blue River form the southern Blue River corridor. Frisco, Dillon, and Silverthorne cluster more closely around Dillon Reservoir, while Keystone is separated to the east in the Snake River valley. Summit County’s official GIS town-boundary service identifies Blue River, Breckenridge, Dillon, Frisco, Montezuma, and Silverthorne as distinct town polygons, which helps confirm that the central map labels represent several separate municipalities rather than one continuous urban area.
Blue River, Snake River, Swan River, and the two major reservoirs
Dillon Reservoir dominates the water and terrain map near the center of the county. The Blue River approaches from the south, while the Snake River and North Fork Snake River occupy the eastern mountain valleys. The Swan River and North Fork Swan River drain another high basin southeast of the reservoir, and Tenmile Creek reaches the central area from the Frisco and Copper Mountain side. Together, these waterways show how several separate mountain basins feed the same central reservoir system.
Summit County’s official hazard plan describes Dillon Reservoir as receiving water from the Upper Blue River, Snake River, and Ten Mile Creek basins. Downstream, the Blue River continues north through Silverthorne and toward Green Mountain Reservoir. Tracing that line on the map is one of the clearest ways to connect the busy central communities with the quieter northern part of the county around Heeney and Green Mountain Reservoir.
Smaller water bodies add detail to the mountain landscape. Lower Cataract Lake, Blue Lake, Black Lake, and Slate Lake appear in the northern high country, while Blue River Ranch Lakes and Uneva Lake provide additional landmarks closer to the central and southern basins. This map is intended for general geographic reference and should not be used as a flood-hazard map, water-rights document, parcel boundary source, or navigation chart.
Elevation from 2,302 meters to 4,341 meters
The elevation map reports an actual county range of about 2,302 to 4,341 meters, with a mean near 3,191 meters. The lowest continuous terrain follows the lower Blue River in the north near Green Mountain Reservoir. Dillon Reservoir, Silverthorne, and the central valleys are also lower than the ridges surrounding them, but even these valley floors sit at high elevations compared with many parts of Colorado.
High terrain surrounds most of the county boundary. The Tenmile Range rises west and southwest of the central basin, while the eastern and southern boundaries contain broad high ridges near the Continental Divide. Breckenridge, Keystone, and Copper Mountain all occupy narrow lower corridors immediately beside much higher slopes. Comparing the elevation and road maps makes it clear why major routes stay in valleys and why short geographic distances can still involve winding mountain travel.
This layer is designed for countywide elevation comparison. It can show where the principal valleys sit and where high ridges dominate, but it is not survey-grade or engineering-grade data. Ski or hiking safety, construction, road design, property surveying, and exact site elevation require current official information and more precise source data.
Breckenridge and Keystone belong to different mountain basins
Breckenridge and Keystone are both major Summit County destinations, but the maps place them in different drainage and road systems. Breckenridge is south of Dillon Reservoir along the Upper Blue River corridor, with Blue River continuing farther south. Keystone is east of the reservoir along the Snake River, separated from Breckenridge by high terrain rather than a simple cross-valley road grid.
Frisco, Dillon, and Silverthorne function as the main geographic link between those two sides of the county. Frisco connects the Tenmile and Breckenridge directions, while Dillon and Silverthorne connect the reservoir area with Keystone and the northern Blue River valley. Reading the road map together with the water map is the quickest way to understand why these nearby communities are organized around several different mountain corridors.
Choosing the most useful Summit County map first
Start with the county map when you need Breckenridge, Silverthorne, Frisco, Dillon, Keystone, major roads, and the county boundary in one view. Use the ranked city map to compare the six principal communities, but remember that it does not provide straight-line or driving mileage. The water and terrain layer is best for Dillon Reservoir, Green Mountain Reservoir, the Blue River, Snake River, Swan River, and Tenmile Creek. Choose the elevation map when the question is how valley settlements fit inside the surrounding high mountains.
For example, to follow the Breckenridge-to-Silverthorne corridor, compare Colorado 9 on the county map with the Blue River on the water map. To understand Keystone, follow the Snake River east of Dillon Reservoir and then compare the same area on the elevation map. Copper Mountain and Frisco are easiest to place by using the I-70 corridor and the Tenmile side of the county as the reference.
Frequently Asked Questions
Does the city map show the distance between Breckenridge and Silverthorne?
No. The supplied city layer ranks and locates Breckenridge, Silverthorne, Frisco, Blue River, Keystone, and Dillon but does not include connector lines, straight-line mileage, or driving distances. Use it for distribution and relative position rather than travel distance.
Which waterways feed the Dillon Reservoir area?
The map shows the Blue River approaching from the south, the Snake River system from the east, the Swan River system from the southeast, and Tenmile Creek from the Frisco side. Downstream, the Blue River continues through Silverthorne toward Green Mountain Reservoir.
Can the elevation map be used for ski, hiking, or engineering safety decisions?
No. The roughly 2,302-to-4,341-meter range is intended for broad geographic comparison. Route safety, exact site elevation, construction, engineering, and surveying require current official information and more precise source data.
Map File Information
The ZIP contains the original high-resolution JPG versions of the county, ranked city, water/terrain, and elevation maps shown on this page. Use the larger files for printing, detailed viewing, or offline reference.
- 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
- Summit County GIS – Towns – official town-boundary reference for Blue River, Breckenridge, Dillon, Frisco, Montezuma, and Silverthorne
- Summit County Multi-Hazard Mitigation Plan – Dillon Reservoir, Upper Blue, Snake, Ten Mile, and downstream Blue River context
- U.S. Census Bureau TIGER/Line Shapefiles – county boundaries, roads, and place reference
- USGS National Hydrography – rivers, streams, lakes, and reservoirs
- USGS 3D Elevation Program – elevation and terrain reference
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.
