There has been some talk about how to serve Ballard with light rail in the future. There have been suggestions for a route running north from downtown to Ballard, and for a “spur” running west from the UDistrict to Ballard.
Advantages of a direct line from downtown:
-shorter Downtown Ballard travel times
-areas in-between, like Belltown, Denny Triangle/SLU, and Lower Queen Anne can be serviced
Advantages to a line running west from Brooklyn station:
-faster service alone 45th Street corridor
-would create both north-south and east-west lines in north Seattle. The entire north Seattle bus network could be redesigned so that every bus route serves at least one LINK station. Presumably, many could serve two (for instance, a bus route could connect Northgate to a stop on the Ballard spur)
If a Ballard spur were built, I first thought it should be a separate line, and not be interlined with other routes. However, I really only think that would be a good option if LINK service were always super-frequent. I now think it should be interlined with other LINK lines. So this is my proposal:

Ballard spur service proposal
There would be four lines:
1. Angle Lake (or whatever the southern terminus is) – Lynnwood (the current “Central Link” plans)
2. Redmond – Lynnwood (the current “East Link” plans)
3. Angle Lake/southern terminus – Ballard
4. Redmond – Ballard
These are my proposed service levels. No longer would there be less frequent service before 6am or after 10pm:
Peak hours: -each line would run every 12 minutes
Off-peak hours: -each line would run every 20 minutes
This would result in the following headways:
Peak hours:
-ID station – Brooklyn station: -every 3 minutes
-Angle Lake/southern terminus – Brooklyn station: -every 6 minutes
-Redmond – Brooklyn station: -every 6 minutes
-ID station – Ballard: -every 6 minutes
-ID station – Lynnwood: -every 6 minutes
Off-peak hours:
-ID station – Brooklyn station: -every 5 minutes
-Angle Lake/southern terminus – Brooklyn station: -every 10 minutes
-Redmond Brooklyn – station: -every 10 minutes
-ID station – Ballard: -every 10 minutes
-ID station – Lynnwood: -every 10 minutes
The only drawback to my plans compared to the current plans would be less frequent service between Brooklyn and Lynnwood. However, I believe that it is worth it to serve Ballard, and to provide one-seat service from Ballard to as far as Angle Lake/southern terminus and Redmond.
Proposed stations:
-45th/I-5 (entrances at both 5th and 7th Avenues)
-45th/Wallingford Avenue
-45th/Stone Way
-45th Aurora (entrances at about Winslow Place and Linden Avenue)
-NW Market/3rd Avenue
-NW Market/15th Avenue
-NW Market/24th Avenue
-NW Market/32nd Avenue