Call-prep brief · checked 2026-08-01

Inter-Island Ferry

Grade C · 73.2 / 100

Down 0.5 points since 2026-07-31 (C to C).

For this call: lead with the grade and the three fixes below, then confirm the feed is current and the NTD details line up. Each fix is framed as a next step, not a failure.

What changed since the last check

Correctness no change
Freshness down 1.7
Rider experience no change

Top three things to fix

Set wheelchair_boarding to 1 (accessible) or 2 (not accessible) for every terminal. A field survey can start with the busiest terminals.
2 of 2 terminals don't say whether a wheelchair user can board there. Riders who use wheelchairs can't plan a trip when accessibility is marked 'unknown'; apps show no information at all.
Effort: A column in stops.txt; your scheduling software likely has it.
Set wheelchair_accessible on every trip. If every vehicle is accessible, this may be one default; otherwise use the value for each trip.
2 of 2 trips don't say whether the vehicle is wheelchair accessible. Even with accessible terminals, riders need to know the vessel itself can take them.
Effort: A default or per-trip field in your export.
Review the rule documentation for 'missing_bike_allowance' at https://gtfs-validator.mobilitydata.org/rules.html and check the flagged rows in your feed.
Missing bike allowance (flagged by the MobilityData validator). See the linked rule for what this affects.
Effort: Varies.

Finding handoff

Move one finding to a recheck

Select one finding. Copy the request, make the change in the feed-producing tool, then compare the next complete run.

Feed evidence: 2 of 2 terminals don't say whether a wheelchair user can board there.
Next action: Set wheelchair_boarding to 1 (accessible) or 2 (not accessible) for every terminal. A field survey can start with the busiest terminals.
Recheck: Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.

Copy handoff text

Agency: Inter-Island Ferry
Finding: scorecard_wheelchair_boarding_unknown
Feed evidence: 2 of 2 terminals don't say whether a wheelchair user can board there.
Why it matters: Riders who use wheelchairs can't plan a trip when accessibility is marked 'unknown'; apps show no information at all.
Requested change: Set wheelchair_boarding to 1 (accessible) or 2 (not accessible) for every terminal. A field survey can start with the busiest terminals.
Recheck: Publish the changed feed at the same URL. On the next complete, comparable scorecard run, confirm that this finding is no longer reported.
Evidence: https://gtfsscorecard.org/agency/inter-island-ferry/?finding=scorecard_wheelchair_boarding_unknown#finding-handoff

NTD GTFS readiness: Needs attention

This feed is close to NTD-ready. Service data runs out in 30 days; renew before you certify.

Published Ready: Published at a public URL.
Valid Ready: Passes validation with no errors.
Current Needs attention: Service data runs out in 30 days; renew before you certify.
agency_id provided Ready: agency.txt provides agency_id. For RY2026, keep one stable value for each NTD reporter represented in the feed and crosswalk each value on the P-50 form.

agency_id equals NTD ID (optional): Not checked yet. This feed provides agency_id. For RY2026, keep one stable value for each NTD reporter represented in the feed and crosswalk it on the P-50 form. The value does not need to equal the five-digit NTD ID; we do not have that ID on file, so the optional equality comparison is not checked yet.

Key facts

Feed URL: https://data.trilliumtransit.com/gtfs/interisland-ak-us/interisland-ak-us.zip
Last checked: 2026-08-01
Service window: 30 days of service data remain. Last service date 2026-08-31.
Feed version: UTC: 17-Feb-2026 10:42
Location: Alaska

Part of the Alaska portfolio: see where this agency sits among the state's feeds before the call.

A data-quality and completeness read to support an agency conversation. Not an official compliance determination. Rubric v1.3, validator 8.0.1.