Great Northern Engineering Drawing: Preliminary Layout, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 31, undated.

Great Northern Engineering Drawing: Proposed Bearing Operating Shaft, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 378, undated.

Great Northern Engineering Drawing: Rack Segment - Bridge Number 4, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 480, undated.

Great Northern Engineering Drawing: Reinforcement Member 20 - 29, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 474, 1951.

Great Northern Engineering Drawing: Reinforcement Steel, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 17, 1912.

Great Northern Engineering Drawing: Reinforcement Steel, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 20, 1912.

Great Northern Engineering Drawing: Repair Main Counterweight Trunnion, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 484, undated.

Great Northern Engineering Drawing: Repairs - Operating Strut Bracket, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 92, undated.

Great Northern Engineering Drawing: Repairs - Solenoid Breakers, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 91, undated.