Costilla County sits at the meeting point of the broad San Luis Valley floor and high mountain terrain along the north and east. San Luis and Blanca are the two strongest city references on the supplied city map, while the county map adds Fort Garland and San Acacio to the road network. US 160, CO 159, and CO 142 provide the easiest transportation landmarks. This page explains those places together with the county’s streams, reservoirs, and elevation changes, and high-resolution JPG originals of the supplied maps are available below in one downloadable ZIP archive.
The landscape changes quickly across the county. The western and southwestern sections are broad and comparatively low, with long straight roads crossing open valley terrain. Farther north and east, the ground rises into rugged mountains cut by narrow stream valleys. Trinchera Creek, Ute Creek, Sangre de Cristo Creek, Culebra Creek, El Poso Creek, and Vallejos Creek are among the named waterways on the terrain-and-water map.
Reservoirs are another important part of the mapped geography. Smith Reservoir and Mountain Home Reservoir are shown in the north-central area, Stabilization Reservoir and Sanchez Reservoir appear farther south, and Eastdale Reservoir No 1 and No 2 are marked in the southwest. The elevation map gives an actual range of about 2,254 to 4,356 meters with a mean near 2,685 meters, making the contrast between the valley floor and the mountain margins especially clear.
Table of Contents
Start with San Luis, Blanca, and Fort Garland
San Luis, Blanca, and Fort Garland make the county much easier to orient. Blanca lies on the northern valley floor near US 160, and Fort Garland sits farther east along the same highway. San Luis is well to the south, reached by CO 159, while San Acacio appears west of San Luis on the county reference map. Together these places show where the main settlement and road corridors are concentrated.
Official Costilla County material identifies San Luis as the county seat and describes San Luis, Blanca, Fort Garland, and other smaller communities as key places in the county. The same official overview also emphasizes the San Luis Valley and the Sangre de Cristo Mountains as the dominant physical setting. Those descriptions match the supplied maps: low valley roads dominate the west, while the north and east become steep and highly dissected.
The road pattern changes with the terrain. Long, relatively straight segments cross the valley floor around San Luis and west of Fort Garland. In the mountains, roads bend into drainage corridors and climb around ridges. Even before switching to the elevation map, that change in road shape is a useful clue to where the county leaves the open valley and enters rugged terrain.
US 160, CO 159, and CO 142 on the county reference map
US 160 is the strongest east-west route on the reference map, connecting the Blanca and Fort Garland area. From Fort Garland, CO 159 runs south toward San Luis, while CO 142 crosses near San Luis and continues toward the county’s eastern and western sides. These three roads provide a simple framework for locating most of the other numbered routes.
CO 150 appears in the northwest, and additional numbered roads such as 10, 11, 12, 21, 2, 5, and 7 are distributed across the southern and eastern parts of the map. Roads across the valley floor often run in long straight lines, while routes entering the eastern mountains become more irregular and follow valleys. That contrast is one of the clearest visual differences on the map.
This is an orientation map rather than a live navigation or property map. It does not show every private access road, current closure, winter restriction, road-surface condition, or parcel boundary. Drivers should check current transportation information before travel, and legal boundary or ownership questions should be verified through county or other authoritative records.
San Luis and Blanca on the ranked city map
The city map simplifies Costilla County by emphasizing San Luis and Blanca. San Luis sits in the southern half of the county near the center, while Blanca is much farther north and west on the valley floor. With most secondary road labels removed, the map makes their separation easy to see and also shows how much of the county extends into mountains east and north of the two city markers.
The CITY INDEX prints a rank and number beside each place. Those values should be treated as part of the map’s city-ranking display rather than assumed to be current official population figures. Anyone who needs current population estimates or demographic change should use a recent U.S. Census Bureau release.
Alamosa County, Conejos County, Huerfano County, and Las Animas County are labeled outside the boundary. These neighboring counties help place Costilla County in south-central Colorado. The city map is ideal for a quick two-city comparison, but readers looking for Fort Garland, San Acacio, numbered roads, or smaller streams should use the county reference map instead.
Trinchera Creek, Culebra Creek, and the county reservoirs
The terrain-and-water map shows several distinct drainage areas. In the north, Trinchera Creek, Ute Creek, and Sangre de Cristo Creek descend from the mountains toward the valley. Smith Reservoir appears along the Trinchera Creek corridor, and Mountain Home Reservoir is marked farther east. The surrounding shaded relief makes it easy to see how these waterways emerge from steep terrain before entering broader lowlands.
Culebra Creek is one of the most prominent waterways in the southern half, crossing a broad section of the county before reaching the mountain side. Stabilization Reservoir is labeled south of the creek, and Sanchez Reservoir appears farther south. Eastdale Reservoir No 1 and No 2 are shown in the southwest, while El Poso Creek and Vallejos Creek occupy steep eastern drainage corridors. Leandro Lake is marked near the southeastern edge.
This map is useful for locating streams and reservoirs, but it is not a real-time water, flood, fishing, water-rights, or water-quality product. Reservoir levels and stream conditions can change significantly. Current conditions and regulatory questions should be checked with USGS and the relevant local or state agencies.
Elevation from the San Luis Valley floor to terrain above 4,300 meters
The elevation map gives the clearest summary of Costilla County’s terrain. Its printed range runs from about 2,254 to 4,356 meters, with a mean near 2,685 meters. Dark green covers most of the western and southwestern valley floor, while yellow, tan, and brown terrain rises sharply in the north and along the eastern mountain margin.
The highest colors are concentrated near the northern tip and along parts of the eastern boundary. Lower green corridors cut into those mountains where streams descend toward the valley. Comparing this surface with the water map helps explain why El Poso Creek, Vallejos Creek, and other waterways follow narrow low routes between high ridges.
The colored elevation surface is intended for broad county comparison, not survey work. It should not be used to assign an exact elevation to a house, road project, ranch parcel, reservoir structure, or other specific site. Engineering and legal work should use source elevation data from the USGS 3D Elevation Program or professional surveying.
Choose the map you need and download the JPG originals
Use the county reference map when you need San Luis, Blanca, Fort Garland, San Acacio, US 160, CO 159, CO 142, and the surrounding road network in one view. The city map is cleaner when the goal is simply to compare San Luis and Blanca without extra road detail.
The terrain-and-water map is the best choice for Trinchera Creek, Culebra Creek, El Poso Creek, Vallejos Creek, and the named reservoirs. The elevation map is more useful when the subject is the broad valley floor, the high northern and eastern mountains, or the county’s large vertical range. Matching the map to the task makes the page easier to use.
The WebP images in the article are reduced previews for faster page loading. The download archive contains the corresponding original JPG files at 2572 × 3638 pixels each. Their portrait A3 proportions make the originals better suited to printing, classroom handouts, reports, presentations, and personal annotation.
Frequently Asked Questions
Which map is best for comparing San Luis and Blanca?
The city map is the simplest choice because it highlights only San Luis and Blanca as the ranked major cities. Use the county reference map if you also need Fort Garland, San Acacio, US 160, CO 159, CO 142, and smaller road details.
Where can I see Trinchera Creek, Culebra Creek, and the main reservoirs?
The terrain-and-water map is the best choice. It labels Trinchera Creek, Ute Creek, Sangre de Cristo Creek, Culebra Creek, El Poso Creek, Vallejos Creek, and reservoirs including Smith, Mountain Home, Sanchez, Stabilization, and the Eastdale reservoirs.
Can the 2,254–4,356 meter elevation range be used for survey work?
No. The range is useful for broad terrain comparison across Costilla County, but the map is not survey-grade. Exact elevation work for construction, roads, parcels, or engineering should use source USGS elevation data or professional surveying.
Map File Information
The ZIP archive contains high-resolution JPG originals of the Costilla County reference, city, terrain-and-water, and elevation maps.
- Printable Size: 2572 × 3638 pixels each
- File Type: ZIP archive containing 4 JPG files
Related Maps
Sources and references
Local geography and community information can be checked through the official Costilla County website and its Costilla County Overview. The county overview describes the San Luis Valley setting, mountain boundaries, major communities, and primary access routes.
Additional data references include U.S. Census Bureau TIGER/Line Shapefiles for administrative boundaries, USGS National Hydrography for water features, and the USGS 3D Elevation Program for elevation data.
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.
