Idaho

Situé au coeur des montagnes Rocheuses, dans le nord-ouest des États-Unis, l'Idaho est un des États les plus isolés et les moins peuplés de l'Union. La population dépasse à peine le million d'habitants pour un territoire qui couvre 216.413 km². La capitale est Boise (126.000 h.)

Au centre-nord et au nord-est de l'État, la chaîne de la Salmon River (3868 m au Borah Peak), la chaîne Lemhi, la chaîne Bitterroot constituent un batholite granitique entouré de son enveloppe métamorphique : elles ont été sculptées par la glaciation quaternaire.

Le sud de l'État fait partie du système volcanique de la Snake. Il présente tantôt des plateaux à la surface scoriacée, au drainage intermittent, tantôt des alignements de cônes de cendres et de lapilli (Monument national des Cratères de la Lune). La Snake creuse un profond canyon dans les laves noires (Hell's Canyon).

Les montagnes bien arrosées, enneigées en hiver, sont couvertes de forêts dont beaucoup appartiennent à l'État fédéral ou à l'État d'Idaho. Les vallées encaissées et les plateaux du sud ont un climat dont la sécheresse (parfois moins de 250 mm de pluies par an) est encore accentuée par la perméabilité de la roche volcanique; la végétation est xérophile (steppe à armoise).

Ours, chevreuils, élans, mouflons trouvent un refuge dans ces montagnes désertes. La Snake et ses affluents (Clearwater, Salmon) sont des rivières à saumons

Boise - Idaho - Yellowstone - Idaho - Pocatello - Idaho - Idaho Falls - Yellowstone - Idaho - Pocatello - Idaho

USA
 Idaho

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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