diff --git a/lib/api/model/initial_snapshot.dart b/lib/api/model/initial_snapshot.dart
index bfd505c9af..86ecd4e9e0 100644
--- a/lib/api/model/initial_snapshot.dart
+++ b/lib/api/model/initial_snapshot.dart
@@ -7,6 +7,11 @@ part 'initial_snapshot.g.dart';
 // https://zulip.com/api/register-queue#response
 @JsonSerializable(fieldRename: FieldRename.snake)
 class InitialSnapshot {
+  // Keep these fields in the order they appear in the API docs.
+  // (For many API types we choose a more logical order than the docs.
+  // But this one is so long that that'd make it become impossible to
+  // compare the lists by hand.)
+
   final String? queueId;
   final int lastEventId;
   final int zulipFeatureLevel;
@@ -21,6 +26,8 @@ class InitialSnapshot {
 
   final List<Subscription> subscriptions;
 
+  final List<ZulipStream> streams;
+
   final int maxFileUploadSizeMib;
 
   @JsonKey(readValue: _readUsersIsActiveFallbackTrue)
@@ -31,6 +38,7 @@ class InitialSnapshot {
   final List<User> crossRealmBots;
 
   // TODO etc., etc.
+  // If adding fields, keep them all in the order they appear in the API docs.
 
   // `is_active` is sometimes absent:
   //   https://chat.zulip.org/#narrow/stream/412-api-documentation/topic/.60is_active.60.20in.20.60.2Fregister.60.20response/near/1371603
@@ -59,6 +67,7 @@ class InitialSnapshot {
     required this.alertWords,
     required this.customProfileFields,
     required this.subscriptions,
+    required this.streams,
     required this.maxFileUploadSizeMib,
     required this.realmUsers,
     required this.realmNonActiveUsers,
diff --git a/lib/api/model/initial_snapshot.g.dart b/lib/api/model/initial_snapshot.g.dart
index 6db0420180..6c1f8049d8 100644
--- a/lib/api/model/initial_snapshot.g.dart
+++ b/lib/api/model/initial_snapshot.g.dart
@@ -24,6 +24,9 @@ InitialSnapshot _$InitialSnapshotFromJson(Map<String, dynamic> json) =>
       subscriptions: (json['subscriptions'] as List<dynamic>)
           .map((e) => Subscription.fromJson(e as Map<String, dynamic>))
           .toList(),
+      streams: (json['streams'] as List<dynamic>)
+          .map((e) => ZulipStream.fromJson(e as Map<String, dynamic>))
+          .toList(),
       maxFileUploadSizeMib: json['max_file_upload_size_mib'] as int,
       realmUsers:
           (InitialSnapshot._readUsersIsActiveFallbackTrue(json, 'realm_users')
@@ -50,6 +53,7 @@ Map<String, dynamic> _$InitialSnapshotToJson(InitialSnapshot instance) =>
       'alert_words': instance.alertWords,
       'custom_profile_fields': instance.customProfileFields,
       'subscriptions': instance.subscriptions,
+      'streams': instance.streams,
       'max_file_upload_size_mib': instance.maxFileUploadSizeMib,
       'realm_users': instance.realmUsers,
       'realm_non_active_users': instance.realmNonActiveUsers,
diff --git a/lib/api/model/model.dart b/lib/api/model/model.dart
index 00daeae420..a4320a28eb 100644
--- a/lib/api/model/model.dart
+++ b/lib/api/model/model.dart
@@ -4,7 +4,8 @@ part 'model.g.dart';
 
 /// As in [InitialSnapshot.customProfileFields].
 ///
-/// https://zulip.com/api/register-queue#response
+/// For docs, search for "custom_profile_fields:"
+/// in <https://zulip.com/api/register-queue>.
 @JsonSerializable(fieldRename: FieldRename.snake)
 class CustomProfileField {
   final int id;
@@ -50,7 +51,8 @@ class ProfileFieldUserData {
 /// cross_realm_bots are all extremely similar. They differ only in that
 /// cross_realm_bots has is_system_bot.
 ///
-/// https://zulip.com/api/register-queue#response
+/// For docs, search for "realm_users:"
+/// in <https://zulip.com/api/register-queue>.
 @JsonSerializable(fieldRename: FieldRename.snake)
 class User {
   final int userId;
@@ -118,18 +120,86 @@ class User {
   Map<String, dynamic> toJson() => _$UserToJson(this);
 }
 
+/// As in `streams` in the initial snapshot.
+///
+/// Not called `Stream` because dart:async uses that name.
+///
+/// For docs, search for "if stream"
+/// in <https://zulip.com/api/register-queue>.
+@JsonSerializable(fieldRename: FieldRename.snake)
+class ZulipStream {
+  final int streamId;
+  final String name;
+  final String description;
+  final String renderedDescription;
+
+  final int dateCreated;
+  final int? firstMessageId;
+
+  final bool inviteOnly;
+  final bool isWebPublic; // present since 2.1, according to /api/changelog
+  final bool historyPublicToSubscribers;
+  final int? messageRetentionDays;
+
+  final int streamPostPolicy; // TODO enum
+  // final bool isAnnouncementOnly; // deprecated; ignore
+
+  final int? canRemoveSubscribersGroupId; // TODO(server-6)
+
+  ZulipStream({
+    required this.streamId,
+    required this.name,
+    required this.description,
+    required this.renderedDescription,
+    required this.dateCreated,
+    required this.firstMessageId,
+    required this.inviteOnly,
+    required this.isWebPublic,
+    required this.historyPublicToSubscribers,
+    required this.messageRetentionDays,
+    required this.streamPostPolicy,
+    required this.canRemoveSubscribersGroupId,
+  });
+
+  factory ZulipStream.fromJson(Map<String, dynamic> json) =>
+    _$ZulipStreamFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ZulipStreamToJson(this);
+}
+
 /// As in `subscriptions` in the initial snapshot.
+///
+/// For docs, search for "subscriptions:"
+/// in <https://zulip.com/api/register-queue>.
 @JsonSerializable(fieldRename: FieldRename.snake)
 class Subscription {
+  // First, fields that are about the stream and not the user's relation to it.
+  // These are largely the same as in [ZulipStream].
+
   final int streamId;
   final String name;
   final String description;
   final String renderedDescription;
+
   final int dateCreated;
-  final bool inviteOnly;
+  final int? firstMessageId;
+  final int? streamWeeklyTraffic;
 
+  final bool inviteOnly;
+  final bool? isWebPublic; // TODO(server-??): doc doesn't say when added
+  final bool historyPublicToSubscribers;
+  final int? messageRetentionDays;
   // final List<int> subscribers; // we register with includeSubscribers false
 
+  final int streamPostPolicy; // TODO enum
+  // final bool? isAnnouncementOnly; // deprecated; ignore
+  final String emailAddress;
+
+  final int? canRemoveSubscribersGroupId; // TODO(server-6)
+
+  // Then, fields that are specific to the subscription,
+  // i.e. the user's relationship to the stream.
+
   final bool? desktopNotifications;
   final bool? emailNotifications;
   final bool? wildcardMentionsNotify;
@@ -138,26 +208,11 @@ class Subscription {
 
   final bool pinToTop;
 
-  final String emailAddress;
-
   final bool isMuted;
-
   // final bool? inHomeView; // deprecated; ignore
 
-  // final bool? isAnnouncementOnly; // deprecated; ignore
-  final bool? isWebPublic; // TODO(server-??): doc doesn't say when added
-
   final String color;
 
-  final int streamPostPolicy; // TODO enum
-  final int? messageRetentionDays;
-  final bool historyPublicToSubscribers;
-
-  final int? firstMessageId;
-  final int? streamWeeklyTraffic;
-
-  final int? canRemoveSubscribersGroupId; // TODO(server-6)
-
   Subscription({
     required this.streamId,
     required this.name,
diff --git a/lib/api/model/model.g.dart b/lib/api/model/model.g.dart
index 00d522edb3..7b7707383a 100644
--- a/lib/api/model/model.g.dart
+++ b/lib/api/model/model.g.dart
@@ -94,6 +94,38 @@ Map<String, dynamic> _$UserToJson(User instance) => <String, dynamic>{
       'is_system_bot': instance.isSystemBot,
     };
 
+ZulipStream _$ZulipStreamFromJson(Map<String, dynamic> json) => ZulipStream(
+      streamId: json['stream_id'] as int,
+      name: json['name'] as String,
+      description: json['description'] as String,
+      renderedDescription: json['rendered_description'] as String,
+      dateCreated: json['date_created'] as int,
+      firstMessageId: json['first_message_id'] as int?,
+      inviteOnly: json['invite_only'] as bool,
+      isWebPublic: json['is_web_public'] as bool,
+      historyPublicToSubscribers: json['history_public_to_subscribers'] as bool,
+      messageRetentionDays: json['message_retention_days'] as int?,
+      streamPostPolicy: json['stream_post_policy'] as int,
+      canRemoveSubscribersGroupId:
+          json['can_remove_subscribers_group_id'] as int?,
+    );
+
+Map<String, dynamic> _$ZulipStreamToJson(ZulipStream instance) =>
+    <String, dynamic>{
+      'stream_id': instance.streamId,
+      'name': instance.name,
+      'description': instance.description,
+      'rendered_description': instance.renderedDescription,
+      'date_created': instance.dateCreated,
+      'first_message_id': instance.firstMessageId,
+      'invite_only': instance.inviteOnly,
+      'is_web_public': instance.isWebPublic,
+      'history_public_to_subscribers': instance.historyPublicToSubscribers,
+      'message_retention_days': instance.messageRetentionDays,
+      'stream_post_policy': instance.streamPostPolicy,
+      'can_remove_subscribers_group_id': instance.canRemoveSubscribersGroupId,
+    };
+
 Subscription _$SubscriptionFromJson(Map<String, dynamic> json) => Subscription(
       streamId: json['stream_id'] as int,
       name: json['name'] as String,
diff --git a/lib/model/store.dart b/lib/model/store.dart
index 6ea7ef178b..b975fd06fd 100644
--- a/lib/model/store.dart
+++ b/lib/model/store.dart
@@ -154,6 +154,8 @@ class PerAccountStore extends ChangeNotifier {
          .followedBy(initialSnapshot.realmNonActiveUsers)
          .followedBy(initialSnapshot.crossRealmBots)
          .map((user) => MapEntry(user.userId, user))),
+       streams = Map.fromEntries(initialSnapshot.streams.map(
+         (stream) => MapEntry(stream.streamId, stream))),
        subscriptions = Map.fromEntries(initialSnapshot.subscriptions.map(
          (subscription) => MapEntry(subscription.streamId, subscription))),
        maxFileUploadSizeMib = initialSnapshot.maxFileUploadSizeMib;
@@ -161,8 +163,10 @@ class PerAccountStore extends ChangeNotifier {
   final Account account;
   final ApiConnection connection;
 
+  // TODO(#135): Keep all this data updated by handling Zulip events from the server.
   final String zulipVersion;
   final Map<int, User> users;
+  final Map<int, ZulipStream> streams;
   final Map<int, Subscription> subscriptions;
   final int maxFileUploadSizeMib; // No event for this.
 
diff --git a/test/example_data.dart b/test/example_data.dart
index 8efa4809df..2fb88d9e04 100644
--- a/test/example_data.dart
+++ b/test/example_data.dart
@@ -109,6 +109,7 @@ final InitialSnapshot initialSnapshot = InitialSnapshot(
   alertWords: ['klaxon'],
   customProfileFields: [],
   subscriptions: [], // TODO add subscriptions to example initial snapshot
+  streams: [], // TODO add streams to example initial snapshot
   maxFileUploadSizeMib: 25,
   realmUsers: [],
   realmNonActiveUsers: [],