A scheduled job pulls the NPS alerts API for federal units and the published state park RSS or JSON feeds for state parks. Each entry is normalized into a row keyed by park unit slug with a closures array. The combined file becomes the source the page group reads on each cache cycle.

Set the cache cadence to hourly during the spring snow-melt window and the fall storm window, daily otherwise. The export pulls the latest alerts each hour, the cache refreshes, and the page picks up the change without an editor touching a post.

Yes. Carry a GeoJSON URL per closure that points at the segment of trail or road the alert covers. The base page renders a small Leaflet block that loads the segments as red lines and the alternate routes as dashed lines. The map renders only when the row carries the GeoJSON field.

Some closures are predictable like a high-country road that closes every November. Carry a seasonal_recurring flag on the closure row. The page renders the closure with the historical pattern in addition to the current alert. Trip planners see that the date is annual rather than this-year only.

Yes through a side block. Permit suspensions live in a separate column because the audience is permit holders rather than day hikers. The block renders only when the suspension is active and the email capture funnels visitors to a notification list for permit reopening.

Yes. Each row carries a canonical_url that points to the original alert on the park website. The page renders the link as a citation under the closure row. Readers can verify the closure on the official source one click away.

Some closures change the park shuttle stop set. Carry a shuttle_impact field that holds either a stop list or a route note. The page renders the shuttle impact as a callout under the closure. Shuttle changes are often more impactful than the trail change itself.

Add a permit_dependencies array per closure that lists permit names affected by the closure. The page renders the closure with a tag for each affected permit. Permit holders see at a glance whether their planned itinerary still works for the trip.