Wyoming Basin ≠ Great Plains Extension—And It Didn't Drive Western Settlement
Two corrections: (1) The **Wyoming Basin** is **not** an extension of the Great Plains. (2) It **was not a major corridor** for settling the Far West.
1. Wyoming Basin vs. Great Plains
- Wyoming Basin: Structural basin **between** the **Rocky Mountains** (Wind River, Gros Ventre, Absaroka ranges) and the **Uinta/Wasatch** – **elevation 1,800–2,200 m**. Sagebrush steppe, oil/gas, coal.
- Great Plains: **East of the Rockies**, **elevation 900–1,800 m**, grasslands, deep soils, agricultural.
- Separator: **Continental Divide / Rocky Mountain front** – a **topographic wall**, not a gradient.
2. Settlement Routes Bypassed the Wyoming Basin
| Trail | Route | Relation to Wyoming Basin |
|---|
| **Oregon Trail** | Platte River → South Pass → Snake River | **North of basin** – crossed Continental Divide at **South Pass (2,300 m)** – gentle, wide. |
| **California Trail** | Platte → South Pass → Humboldt River (NV) | **North of basin** – same South Pass crossing. |
| **Mormon Trail** | Platte → South Pass → Fort Bridger → Salt Lake | **Skirted basin south edge** – Fort Bridger *in* basin, but main flow north. |
| **Overland Stage / Pony Express** | Similar corridors | Used **South Pass / Bridger Pass** – avoided basin interior. |
| **Transcontinental RR (1869)** | Platte → **Evans Pass (Wyoming Basin!)** → Salt Lake | **First major route THROUGH basin** – Union Pacific chose **Bridger Pass (2,100 m)** over South Pass for grade. |
Why the Basin Was Avoided (Pre-Rail)
- Arid: <250 mm/yr – no grass for oxen, no water for weeks.
- High elevation: Cold nights, short season, hard on livestock.
- No landmarks: Featureless sagebrush ocean – navigation hell.
- Shoshone / Ute resistance: Basin was **Native homeland** – travelers targeted.
The Railroad Changed Everything
- **1868–69:** UP built **across southern Wyoming Basin** (Cheyenne → Evanston → Ogden).
- **Towns born:** Cheyenne, Laramie, Rawlins, Rock Springs, Green River, Evanston.
- **Coal & cattle** shipped east; settlers rode west.
Conclusion
The **Wyoming Basin was a barrier, not a gateway**, for wagon trains. The **railroad** made it a corridor. The **Great Plains** (Platte River) was the true **settlement highway**—the basin was the detour.
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