i heard you have to register in every day, and there isn't a place to register in the tri-cities. 
Regulations
Anglers participating in the Northern Pikeminnow Sport Reward Fishery must adhere to each of the following rules:
1. Present a valid fishing license and picture identification upon request by any authorized program representative.
2. Adhere to all applicable state fishing regulations for the area in which you fish. Contact your local state fishery agency for license requirements and current fishing regulations.
◾Link to Washington’s Fishing Regulations.
◾Link to Oregon’s Fishing Regulations.
◾Link to Idaho’s Fishing Regulations.
3. Register in person at one of the designated registration stations each day prior to fishing. Anglers may register during times when stations are unstaffed, by using the station’s self-registration box. Anglers may not register at multiple stations on the same day.
4. Provide true and accurate information to authorized program representatives regarding the taking, possession, delivery, transportation, sale, transfer, or any other use of fish caught while participating in the Northern Pikeminnow Sport Reward Fishery Program.
5. Comply with the directions of authorized program personnel related to the collection of sampling data and angler participation in the Sport Reward Fishery.
6. Mail in all reward vouchers within 30 days from the end of the year’s fishery. To obtain payment vouchers must be received no later than Nov. 15 for each year’s fishery. Any issues preventing payment (missing information, voiding of voucher for program violations, etc.) must be resolved by Nov. 15 for each year’s fishery or the voucher becomes null and void..
7. Fish must have been caught in the mainstem Columbia River from the mouth up to the restricted zone below Priest Rapids Dam, or in the Snake River from the mouth up to the restricted zone below Hell’s Canyon Dam. The “mainstem” includes backwaters, sloughs, and up tributaries 400 feet from the tributary mouths. “Tributary mouth” is as defined by state fishing regulations.
8. Fish must be returned to the same registration station where the angler registered. They must be returned on the same calendar day stamped on the angler’s registration form, before that station closes for the day, and they must have been caught subsequent to that days’ registration time.
9. Fish must have a total length greater than or equal to 9 inches. Fish less than 9 inches total length are not eligible for reward payment.
10. All fish to be redeemed for reward payment must have been personally caught solely by the angler submitting them for reward payment.
11. Fish must be alive or in fresh condition. Fish that are or were frozen, or that are in otherwise poor condition will not be accepted for payment. Technicians have the authority to determine whether northern pikeminnow submitted meet these standards.
12. Violation of any of the above rules may result in disqualification from the Northern Pikeminnow Sport Reward Fishery Program.
