Fishing for smallmouth bass in the upper Willamette River can be a rewarding experience, as this area offers a diverse habitat suitable for smallmouth. Here are some tips and techniques that could enhance your fishing trips based on general smallmouth bass fishing strategies, including insights from the video contexts provided.

1. Understanding Habitat: Smallmouth bass in river systems like the upper Willamette often prefer areas with structure and current. Look for features such as rock piles, submerged logs, weed beds, and drop-offs. These structures provide shelter and feeding opportunities for smallmouth. In river settings, as mentioned in the videos, identifying underwater structures with electronics can be very beneficial.

2. Seasonal Patterns: During the spring and early summer, smallmouth bass are often found in shallower water, especially during their spawning period. As the season progresses towards fall, they might move to deeper sections of the river, especially during the hottest parts of the day. Adjust your fishing depth accordingly.

3. Lure Selection: Based on the video insights, using a variety of lures can be effective. Inline spinners, tube jigs, and swim jigs are excellent choices. Topwater lures can also be very effective, especially in early morning or late evening. The subtle presentation of a swim jig with a craw trailer, as mentioned by Jon B., can be particularly effective in areas with lighter current and around subtle structures.

4. Technique: Casting near structures and allowing your lure to drift with the current can be a productive technique. It mimics natural prey movements. Also, consider the use of finesse techniques like drop-shotting or using soft stick baits when the bite is tough. These methods can entice wary fish in clear water conditions.

5. Use of Electronics: As highlighted in one of the videos, using electronics to identify sand drops and other underwater features can significantly enhance your ability to locate smallmouth bass. Mapping and understanding the contour changes within the river can lead you to areas where smallmouth are likely to congregate.

6. Local Knowledge: Always consider local fishing reports or engage with local anglers and guides. They can provide updated information on what's working and the current conditions of the river.

Remember, every day on the water can be different, so flexibility in techniques and trying different areas along the river can lead to success. Enjoy your time targeting smallmouth on the upper Willamette River, and always practice responsible fishing by adhering to local regulations and practicing catch and release when appropriate.