Geology
Union County, NM
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Northeastern New Mexico state park best known for a major Early Cretaceous dinosaur trackway exposed on the dam spillway—hundreds of ornithopod and theropod prints plus rare tail-drag traces. The reservoir, short trails, visitor exhibits, and a small observatory sit on shortgrass high plains near the Colorado and Oklahoma lines.
| Region | Union County, NM |
|---|---|
| Coordinates (approx.) | 36.5783, -103.3058 |
| Tracks | ~500+ dinosaur footprints (spillway) |
| Age | Early Cretaceous sandstone |
| Elevation | ~5,186 ft |
| Nearby | Clayton / Capulin Volcano NM |
Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.
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Plan ahead. Leave no trace. Verify current access before traveling.