Things in South Dakota Starting with "I"

• I-29 & I-90: Major **Interstate highways** crossing the state (I-29 N-S eastern edge; I-90 E-W southern tier).
• Indian Reservations (9): **Pine Ridge** (Oglala Lakota), **Rosebud** (Sicangu Lakota), **Cheyenne River**, **Standing Rock** (partly), **Lower Brule**, **Crow Creek**, **Lake Traverse** (Sisseton Wahpeton), **Flandreau**, **Yankton**. Cover ~20% of state land. Sovereign nations.
• Iron: **Iron ore** mined historically in **Black Hills** (near Lead/Deadwood). **Homestake Mine** (gold) also produced iron minerals. Not a major current producer.
• Inyan Kara Mountain: Sacred **Lakota site** in Black Hills (near Sundance, WY border). "Rock Gatherer" — vision quests.
• Interstate State Park: **Not in SD.** (It's MN/WI). *Correction: SD has **Custer State Park**, **Badlands NP**, **Wind Cave NP**, **Jewel Cave NM**.)
• I-90's "Wall Drug" (Wall, SD): Iconic **roadside attraction** since 1931. Free ice water, 5¢ coffee, giant jackalope, western wear, donuts. Must-stop.
• Ingalls Homestead (De Smet): **Laura Ingalls Wilder's** "Little Town on the Prairie" childhood home. Living history museum.
• I-29's "Porter Sculpture Park" (Montrose): Giant **scrap metal sculptures** (60-ft bull, T-rex) by Wayne Porter. Roadside art marvel.

Note: "Igloos" are Inuit (Arctic), not South Dakota. "Iowa" borders SE SD (Big Sioux River).