Cattle and tourists will dismantle the headwater terraces Indians built.

Evidence

Some day my buck will get a .30-. in his glossy ribs. A clumsy steer will appropriate his bed under the oak, and will munch the golden grama until it is replaced by weeds. Then a freshet will tear out the old dam, and pile its rocks against a tourist road along the river below. Trucks will churn the dust of the old trail on which I saw wolf tracks yesterday. — Aldo Leopold, A Sand County Almanac, 535

Categorization

• ADDENDUM: The trajectory — Indian terrace-farmers, then cattle, road, tourists — is a compression of the disturbance history narrative the reader traces across all four courses.
• XREF: connects to: Prehistoric terrace farmers inhabited the Gavilan for centuries without degrading it. — Aldo Leopold, A Sand County Almanac: With Other…, 532